Overriding this option will cause the layer to be placed on another pane by default. Course Description. Composite Leaflet Layer. This plugin for leaflet provide support for order overlay layers in leaflet maps, for clone this code:. Layers which allows users to switch between different base layers and switch overlays on/off. It can display map tiles, vector data and markers loaded from any source. If you continue browsing the site, you agree to the use of cookies on this website. This is a good way to provide dynamic spatial data, though bear in mind these html files can get large if you are trying to show a lot of data points or polygons. The follows is a micro discussion area for methods of implementation. New leaflet layers: DAV Huts. 1 Updating this issue. The troposphere, the stratosphere, mesosphere, ionosphere and exosphere are the layers of the atmosphere. This site contains a series of web map tutorials and examples. Using leaflet. In OpenLayers, the primary rendering engine is the HTML Canvas. Precious 2. Grouping base layers is not currently supported, but adding exclusive layer groups is. The full listing of free to use layers can be previewed. But the trade-off between ease-of-use from R(Studio) and flexibility is generally OK. The follows is a micro discussion area for methods of implementation. colleges and universities. The new JSON Format GeoJSON allows you to easily embed geographical features in your leaflet webmap. NC State University and N. class: center, middle, inverse, title-slide # Making interactive leaflet maps with R ## Francisco Rodríguez-Sánchez ### @frod_san www $ $ $ The directory name is the name of the app (optional) defines objects available to both ui. Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps. Alexandre Neto's blog; Anita Graser; Faunalia; Info Geo Blog; Ireland QGIS User Group Blog. As people age, they may lose some of this tissue. Many kinds of layers are available, from. Leaflet has a nice little control that allows your users to control which layers they see on your map. To add layers, one simply assigns a particular group to an addPolygons code chunk and control the final output using the addLayersControl function. Layer ⊗ by Nordai s. Below the javascript code for Leaflet and the plugin can be found. Bing Maps Layer for Leaflet v1. edu is a platform for academics to share research papers. js Identify overlapping polygons Leaflet Draw Leaflet Fullscreen Leaflet Geodesy Leaflet Hash Heatmap from markers Leaflet Heat Leaflet Label Leaflet Locate Leaflet-MiniMap Leaflet OSM Zoom bar Cycling directions Walking directions Driving directions Show drawn polygon area Static map with geo-viewport Static map from GeoJSON with. R Leaflet Tutorial | Groups and layers | Grouping the layers | Add Layer Control to map | demo #14 Best viewed in full screen Link to the code files - https:. In OpenLayers, the primary rendering engine is the HTML Canvas. A layer for leaflet can be anything, from a map to an SVG element, or a pin image. The Routing Plugin for Leaflet makes it easy to send requests to the MapQuest Directions API Web Service, receive the results, and display the result on a map. In leaflet: Create Interactive Web Maps with the JavaScript 'Leaflet' Library. This example demonstrates use of several different R packages that provide functions for reading and/or writing shapefiles. The leads to the following changes (main PR #2266): Added Layer class which all layers added to a map should inherit from. Description Usage Arguments Examples. js and the code to use it without dependencies. 3d biology blogdown data-science ecology ecopath ecosystem emoji ggplot2 gis github gitlab kaggle leaflet life-cycle mesh3d mgx2r morpho multilingual openbugs plant-science r-package raster rayrender rayshader reporting rgl rstats rvcg sdm sf sp spatial switch tmap uncertainties uncertainty. In Prot & Skallerud (2009) it was shown that if the leaflet is modelled as a layered structure using layers with different material properties then the stresses in the fibre direction and the. Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps. 4 - 68km W of Anchor Point, Alaska +-. The layers control is smart enough to detect what layers we’ve already added and have corresponding checkboxes and radioboxes set. This allows different information to be displayed depending on the choice of selection. Precious 2. In this chapter, let us discuss how to add multi-polygons, multirectangles, and polylines. Course Description Get ready to have some fun with maps! Interactive Maps with leaflet in R will give you the tools to make attractive and interactive web maps using spatial data and the tidyverse. Embedding Leaflet in your page. group: the name of the group the newly created layers should belong to (for clearGroup and addLayersControl purposes). 5 GB of storage or 4 hours. which I am unable to do so can you please guide me as to what needs to be done to replicate the example on my local machine. There are a number of ways to make choropleth visualizations in R, including the ggmap package and the choroplethr package. This buildings layers contains POLYGON geometries that contain the information to draw the shapes of the buildings at the field station. Deprecated since version 0. Leafletslider maintained by dwilhelm89. Swiss - rzoller. Since Leaflet does not seem have a legend control out of the box, I wrote a small leaflet plugin to do it. Pixlr, a free online set of editing tools, provides many of the same features as Photoshop, including the ability to work with several separate layers that you can merge into one image. This page shows mini maps for all the layers available in Leaflet-providers. We can then switch to tmap, then choroplethr, and finally to leaflet for some interactive maps. Betmiga 25 mg prolonged -release tablets Betmiga 50 mg prolonged -release tablets. The full listing of free to use layers can be previewed. Center map example. Can anyone, please, explain why does the map script goes after the map div and not in the body section? As soon as I place it in the body, the map stops working. The documentation for leaflet is really good, check it out for more information. Layers is the newest way to visualise the weather now and in the future. Center map example. Check the demos to see the library in action. js, which is built on top of Leaflet. There are three ways how to use OpenMapTiles as a map layer in Leaflet:. Let me show you how to reduce the number of map elements with a slider in leaflet to filter your data interactively. Leaflet Clusters This plugin clusters the markers and shows the number of items in each cluster, and as we zoom it adjusts the clusters based on the current view. In this course, you will create maps using the IPEDS dataset, which contains data on U. autoZIndex. Leaflet Tips and Tricks, is in it's early stages (still only 160 pages or so) but the framework is in place and a good level of starting information is available. Great! This session is the first part of a series that introduce Leaflet, a Javascript library used to create interactive, web-based, mobile-friendly maps. RStudio wrote R bindings for Leaflet, available through its leaflet package, built with htmlwidgets. This is a good way to provide dynamic spatial data, though bear in mind these html files can get large if you are trying to show a lot of data points or polygons. Map tiles are provided by default through OpenStreetMap, or MapQuest (with an app key). I thought I'd follow up on an example I wrote up for static bathymetric maps with a (very) quick example of interactive mapping with leaflet in R. As before, we create the Leaflet map widget, add the OSM tiles and add the polygons. Warning: the projection of both historical maps (EPSG:31370) is different from the default projection used by Leaflet, but specifying that falls outside of the scoop of this walkthrough. The page will show you the name to use with leaflet-providers. Syncopation 6. Composite Leaflet Layer. 8 Making maps with R | Geocomputation with R is for people who want to analyze, visualize and model geographic data with open source software. Adding ArcGIS map services to your map The first step to adding layers would be to download the JavaScript library at ESRI's GitHub account here (the file is esri-leaflet. If you are new to the MapQuest Plugins for Leaflet, you'll want to look at the Getting Started section in the Leaflet Plugins documentation. When Leaflet adds features in this layer to the map, it will run each of them through this style function and apply the results. Leaflet divHeatmap: Lightweight and versatile heatmap layer based on CSS3 and divIcons: Leaflet-semicircle: Adds functionality to L. The HTML file created during tiling has an example of how to create. Implementing Custom Layers. Create Interactive Web Maps in R using Leaflet package 1. Syncopation 6. Providers requiring registration. Show/Hide Layers. if TRUE (the default), the layers control will be rendered as an icon that expands when hovered over. This documentation is has been transcribed from the original README. Description. To do this, you should choose a basemap and layers that have great cartography, work at multiple scales, draw quickly, contain informative and accurate information, target a specific audience, and have visible legends if the symbology is not intuitive. The new JSON Format GeoJSON allows you to easily embed geographical features in your leaflet webmap. GroupedLayerControl. For all things that do not belong on Stack Overflow, there is RStudio Community which is another great place to talk about #rstats. The basic concept of a ggplot2 graphic in R is that you combine different elements into layers. Using «leaflet-rastercoords» The example provides layers for markers, geoJson, and polygons. Create a Leaflet map widget. Leaflet works with layers. Also fired on mobile when the user holds a single touch for a second (also called long press). To add layers, one simply assigns a particular group to an addPolygons code chunk and control the final output using the addLayersControl function. Layer base class. Many other types of layers are supported via plugins. Video created by Johns Hopkins University for the course "Developing Data Products". This allows multiple map layers and control settings to be added interactively, as demonstrated in the code below which generates Figure 8. Interactive viewing of spatial data in R. In the zone of leaflet-strut chordae transition geometric changes and collagen fibre angle distribution have been described. Leaflet layer toggling. Well, the developers of Leaflet put a lot of effort into balancing the desire for a library that feels like an R library and stays true to the underlying Leaflet JavaScript library. home > maps > examples > leaflet > Leaflet marker array Define an array with coordinates and popup content text, and then loop through to add them to the map as markers. The newly-generated tiles can be used as a Leaflet Tile Layer. Show/Hide Layers. This site contains a series of web map tutorials and examples. Leaflet Layer Switcher Used the layers control to allow users to easily switch different layers on your map. Interactive Maps with leaflet in R will give you the tools to make attractive and interactive web maps using spatial data and the tidyverse. To add layers, one simply assigns a particular group to an addPolygons code chunk and control the final output using the addLayersControl function. Leaflet Vector Layers monitors map events - like pan and zoom - and fetches features within the map bounds after each event. And because this is R, where diversity is king, why not offer one more function for creating color blind friendly palettes. For adding layers controls, we need to provide the name of the group the newly created layers should belong to. leaflet-groupedlayercontrol is free software, and may be redistributed under the MIT-LICENSE. A few custom plugins were created for this project, their structure is reflected below. Tile layers are also useful when you need to expose a map or layer on the web for the visualization of relatively static data. And because this is R, where diversity is king, why not offer one more function for creating color blind friendly palettes. 5 GB of storage or 4 hours. Leaflet is a lightweight open-source library for online maps. » Multiple Layers Support with Leaflet Module Version 7. A simple example map looks. FunctionalTileLayer. It is completely free, Open Source JavaScript, released under the 2-clause BSD License (also known as the FreeBSD). Leaflet has support for tile layers, markers, popups, polygons and more, as well as user interactions such as mouse scroll-wheel zoom on the desktop and multi-touch zoom for iOS, Android 4. Providers requiring registration. Add a Leaflet polyline to a map. We have already seen a simple use of leaflet in the tmap example. Bing Maps Layer for Leaflet v1. by Abdul-Wahab April 25, 2019 Abdul-Wahab April 25, 2019. Precious 2. Page 1 of 1 (1 post) talks about » openlayers gis; Blog List. In addition to showing you how to use it, we'll also show you another handy use for layer groups. 1 Updating this issue. easyButton for the leaflet-sidebar toggle followed by search, loading, fullscreen, default extent, location and layers control tools. answered Sep 8 '16 at 3:49. Leaflet-providers. markers and polygons) can share the same group name. This means that you can work with them just like data. In the last section we discussed how to obtain and then process data from the Global Biodiversity Information Facility using the rgbif package from rOpenSci in R with RStudio. In this chapter, we will discuss how to use the shapes provided by Google Maps. Furthermore, there is a lot more information now about Leaflet than in 2012, and it's a more mature technology. Each layer of a ggplot2 graphic contains information about the following: The data that you want to plot: For ggplot(), this must be a data frame. This site includes examples from Leaflet, Turf JS and Mapbox GL JS. Thus, Leaflet relies on third-parties to supply users with a variety of map layers. This functionality is enhanced by the sf use of list columns and integration with dplyr verbs. Each of these features are captured in separate mapping layers. extras drawing tool can be used as a bounding box to select any area on a Shiny Leaflet map and to highlight and identify all locations in that area. extras, which enables users to draw shapes on R Shiny Leaflet maps. Leaflet Vector Layers allows users to add one or more vector layers from a number of different geographical web services to a Leaflet map. I was recently asked to expand on my post on making interactive maps to show how to produce a leaflet map with an inset map and nice lat/lon labels of suitable quality to be used in publication. For example, the image below shows a wall made up of four layers—½ inch drywall inside for aesthetic purposes, real insulation in between the studs, ¾ inch plywood sheathing outside, and wood siding as the final exterior finish. This function creates a Leaflet map widget using htmlwidgets. A note on Pipes in R. Inside a viewport, leaflet applies one layer on top of each other. And because this is R, where diversity is king, why not offer one more function for creating color blind friendly palettes. SERA Visualization Tool. Philips Internal Drive DVD 8x ReWriter DVDRW885 8. Layer ⊗ by Nordai s. This allows different information to be displayed depending on the choice of selection. Along with markers, we can also add various shapes such as circles, polygons, rectangles, polylines, etc. Providers requiring registration. Here is a quick example with the breweries91 data from leaflet. Swiss - rzoller. These maps are presented here for your enjoyment and use wherever you display OpenStreetMap data. During this module, we'll learn how to create R Markdown files and embed R code in an Rmd. This sample demonstrates how to pass ArcGIS Services to Leaflet's native Control. O, number of layers: 2 to 3. • Surfacing with FLUXODUR 58 TIC. For adding layers controls, we need to provide the name of the group the newly created layers should belong to. colleges and universities. As before, we create the Leaflet map widget, add the OSM tiles and add the polygons. autoZIndex. Package ‘leaflet. You can pass your data at this point with the data argument, or add it later on. Spatial objects (points, lines, polygons, rasters) in your R environment can also be added as map layers, provided that they have a CRS defined with a datum. extras, which enables users to draw shapes on R Shiny Leaflet maps. There are five layers within the atmosphere. In this map, we can try something different and load the Stamen Watercolor as the Basemap. Leaflet Vector Layers monitors map events - like pan and zoom - and fetches features within the map bounds after each event. For all things that do not belong on Stack Overflow, there is RStudio Community which is another great place to talk about #rstats. This tutorial shows only marker layers, but you could create icons for polygon layers and use those as well. The Leaflet Flowmap Layer Sarah Bellum's Canvas Flowmap Layer is a popular ArcGIS JavaScript API library which allows you to map objects flowing from one location to another. The mechanical properties of PGS depend on its crosslinking density, so its mechanical. Tim Jenks creates a dynamic map of the London Underground with eegeo. Great! This session is the first part of a series that introduce Leaflet, a Javascript library used to create interactive, web-based, mobile-friendly maps. ### Vectors API improvements Leaflet vector layers rendering got a major rewrite, making it possible to switch between rendering backends (Canvas, SVG) dynamically. Once the tiling's been done, you can open the QTiles-generated phillybuildings. ImageMapLayer documentation. - Keep this leaflet. Also, longitude and latitude sliders in the browser allow for cropping the map. Leaflet KML Load a layer from a KML file. Add data Layers. Layers which allows users to switch between different base layers and switch overlays on/off. leaflet provides bindings to the ‘Leaflet’ JavaScript library, “the leading open-source JavaScript library for mobile-friendly interactive maps”. Using leaflet. Grouping base layers is not currently supported, but adding exclusive layer groups is. Leaflet supports the plotting of multiple choropleth layers. MD to jsdoc's or natural docs style for use with Leafdoc. x of leaflet. The ESRI Shapefile is a widely used file format for storing vector-based geopatial data (i. If you haven't worked with Leaflet before, take a look at its tutorials. And there is excellent documentation if you want to dig deeper into its functionality after this. This layer contains most of the air and oxygen in the atmosphere. FeatureLayer documentation. Here's a quick reproducible example of what I'm working with:. For adding layers controls, we need to provide the name of the group the newly created layers should belong to. class: center, middle, inverse # Web Mapping in R ## using Leaflet ### Bhaskar Karambelkar ### 2017/01/13 --- background-image: url(http://leafletjs. Course Outline. Explore a wide range of scenario results from multiple scenarios of possible hydrogen fuel cell vehicle and fueling infrastructure deployment futures. If you continue browsing the site, you agree to the use of cookies on this website. Leaflet Tips and Tricks, is in it's early stages (still only 160 pages or so) but the framework is in place and a good level of starting information is available. In the previous chapter, we learned how to use markers in Leaflet. - Keep this leaflet. html file in the browser to see the tiles on a Leaflet map: QTiles generated tiles on a Leaflet map Using Slippy Map Tiles in Leaflet. Build An Interactive Game of Thrones Map (Part I) - Node. Like most modern JavaScript libraries, Leaflet is easy to build upon, you just extend the core classes and override methods where necessary. MD to jsdoc's or natural docs style for use with Leafdoc. In this chapter, we will discuss how to use the shapes provided by Google Maps. GroupedLayerControl. A simple example map looks. You can assign events in the same way, turning them on one at a time as Leaflet loops through your GeoJSON features and adds them to the layer. This page shows mini maps for all the layers available in Leaflet-providers. js Identify overlapping polygons Leaflet Draw Leaflet Fullscreen Leaflet Geodesy Leaflet Hash Heatmap from markers Leaflet Heat Leaflet Label Leaflet Locate Leaflet-MiniMap Leaflet OSM Zoom bar Cycling directions Walking directions Driving directions Show drawn polygon area Static map with geo-viewport Static map from GeoJSON with. In the following example, I create an. How do you set the layer order in R's leaflet package so that tiles show up on top of polygons filled with color?. Publish your application: Websites that use Leaflet Control Search For questions and bugs: I recommend you to create New Issue on Github repository. Ischemic mitral regurgitation (MR) is a common clinical problem, developing after myocardial infarction in up to 19% of patients. Bing Maps Layer for Leaflet v1. Precious 2. OpenLayers makes it easy to put a dynamic map in any web page. The R-value of a composite wall is calculated by adding the effective R-values of each of the layers of the wall. Read in data using sf and raster packages. For example, I will define “Study area” as the group for the llanos layer, and the “Landsat scenes” group for the wrs2 layer. Remember Me. Leaflet is designed with simplicity, performance and usability in mind. Bug tracker Roadmap (vote for features) About Docs Service status. Leaflet is an open source JavaScript library for mobile-friendly interactive maps. Studart and his co-researchers in creating artificial heart valves via 3D printing. Thus, Leaflet relies on third-parties to supply users with a variety of map layers. Feb 28, 2019 While I was planing a Ski tour I landed on a DAV website to reserve Hut. This R(Studio)--Leaflet combo can tap into the larger ecosystem of dedicated spatial libraries in R, and through the GNU/Linux environment into robust open source libraries such as GDAL and command line tools such as exiftool. This function creates a Leaflet map widget using htmlwidgets. The air usually gets there either from the lungs or from outside the body. I am delighted by the possibility to select at runtime the layers to display using addLayersControl. leaflet documentation: Getting started with leaflet. There are five layers within the atmosphere. Select the "Hide Controls" option to declutter the image. Assorted Leaflet Tips and Tricks Make your map full screen. class: center, middle, inverse, title-slide # Creating Interactive GIS (Web) Applications with Shiny and Leaflet ###. First, it displays rasterized map data rather than just point layers. LAYERS by leaflet, released 23 November 2016 1. When Leaflet adds features in this layer to the map, it will run each of them through this style function and apply the results. Added method addMapPane to add custom pane layers to have fine tune control over layer ordering. I was recently asked to expand on my post on making interactive maps to show how to produce a leaflet map with an inset map and nice lat/lon labels of suitable quality to be used in publication. So, the open source R community came up with "leaflet()" package. Leaflet supports the plotting of multiple choropleth layers. Let me introduce the GetColors function in the R-package inlmisc. And there is excellent documentation if you want to dig deeper into its functionality after this. The National Map Base Maps Jason C Fisher. You’ll need one more package, dplyr, for some piping functions. Revolutionary R&D Inhouse laboratory Deep understanding of the market Global awareness of customer needs Problem solving mentality Lifetime extension Energy saving & Eco Friendly Life Cycle Cost reduction Maintenance friendly Corporate Social Responsibility Quality Innovation Sustainability. I need to update the layers and filter the. Read in data using sf and raster packages. When you have multiple layers, it can help to add a legend to the map. On the other hand, if I select to remove the choropleth, I am left with the legend, when the legend does not make much sense (having just removed the object the legend is referring to). I have used Carto in the past trough the web editor with success (since they are handling server-side the shapefiles and I think they simplify the shapes when you zoom. Display 3D maps in just a few lines of code and overlay data from a 3rd-party API. Leaflet is a modern open-source JavaScript library for mobile-friendly interactive maps, but with MapBox layers as default; Retrieved from "https:. onEachFeature is a more general-purpose function that Leaflet will invoke for each feature as it is added to the map. The leaflet-zoom-hide class is needed so that the overlay is hidden during Leaflet's zoom animation; alternatively, you could disable the animation using the zoomAnimation option when constructing the map. Our tools let developers build a new world powered by location data. Only group tiled layers / image layers/image map layers and don't worry about the feature layers (my understanding is the feature layers will be drawn in as graphics in the browser, but not the aforementioned layers) 2. Leaflet Welcome to the official Leaflet community forum! Here you can discuss any Leaflet-related topics that go beyond the scope of a simple GitHub issue report — ideas, questions, troubleshooting, feedback, etc. This R package makes it easy to integrate and control Leaflet maps in R. The mechanical properties of PGS depend on its crosslinking density, so its mechanical. Here is the course link. class: center, middle, inverse # Web Mapping in R ## using Leaflet ### Bhaskar Karambelkar ### 2017/01/13 --- background-image: url(http://leafletjs. These maps are presented here for your enjoyment and use wherever you display OpenStreetMap data. Adding ArcGIS map services to your map The first step to adding layers would be to download the JavaScript library at ESRI's GitHub account here (the file is esri-leaflet. With layers at the same time you can open up multiple data at once and make analysis in view by looking over the overlay layers. Leaflet supports Web Map Service (WMS) layers, GeoJSON layers, Vector layers and Tile layers natively. The good news is that the leaflet library gives us loads of options to customize the web look and feel of the map. How do you set the layer order in R's leaflet package so that tiles show up on top of polygons filled with color?. The Leaflet R package was created by the folks behind RStudio to integrate with the popular opensource JavaScript library. For example, the image below shows a wall made up of four layers—½ inch drywall inside for aesthetic purposes, real insulation in between the studs, ¾ inch plywood sheathing outside, and wood siding as the final exterior finish. Bing Maps Layer for Leaflet v1. Mapbox maps use more than 130 multi-validated sources for a comprehensive, precise map all over the globe. It is under active development. Total customization. • Surfacing with FLUXODUR 58 TIC. Composite Leaflet Layer. Plotly R Open Source Graphing Library. the layer id. There are a number of ways to make choropleth visualizations in R, including the ggmap package and the choroplethr package. However, map content is limited to the United States and Territories. To put things into perspective, if we've already rendered a map, we might make an HTTP request on an interval and draw. class: center, middle, inverse # Web Mapping in R ## using Leaflet ### Bhaskar Karambelkar ### 2017/01/13 --- background-image: url(http://leafletjs. Weighing just about 38 KB of JS, it has all the mapping features most developers ever need. Get ready to have some fun with maps! Interactive Maps with leaflet in R will give you the tools to make attractive and interactive web maps using spatial data and the tidyverse. Also, longitude and latitude sliders in the browser allow for cropping the map. The layers are all spatialPolygons and thus can be plotted using the routines that come with the sp and associated packages. 5 GB on 1 disc First drive ever for 8. OpenLayers has been developed to further the use of geographic information of all kinds. Leaflet works on an ecosystem of 3rd party plugins. Custom styling of polygons with the style option. A pneumothorax describes the condition in which air has become trapped between a lung and the chest wall. You'll need one more package, dplyr, for some piping functions. js and the code to use it without dependencies. Leaflet is one of the most popular open-source JavaScript libraries for interactive maps. #Initializing the Map and SVG Overlay. You can allow users to decide what layers to show and hide, or programmatically control the visibility of layers using server-side code in Shiny. Uses Leaflet's built-in layers control feature to allow users to choose one of several base layers, and to choose any number of overlay layers to view. This R package makes it easy to integrate and control Leaflet maps in R. The Leaflet package includes functions to show and hide map layers. I thought I'd follow up on an example I wrote up for static bathymetric maps with a (very) quick example of interactive mapping with leaflet in R. OpenLayers makes it easy to put a dynamic map in any web page. RStudio wrote R bindings for Leaflet, available through its leaflet package, built with htmlwidgets. Earthquakes Over the Last 24 Hours Currently displayed: M 1. Leaflet divHeatmap: Lightweight and versatile heatmap layer based on CSS3 and divIcons: Leaflet-semicircle: Adds functionality to L. Until I can figure out “hover” events for R+leaflet, you’ll have to live with “click”. Here is an example of The Leaflet Extras Package:. Stamen's toner, terrain and watercolor map styles are lovingly crafted and free for the taking. The leaflet package in R provides access to the Leaflet Javascript GeoJSON and TopoJSON, Raster Images, Shiny Integration, Colors, Legends, Show/Hide Layers,.