I want to display the attributes of a shapefile layer using leaflet, I found that should i to convert the layer from shp to GeoJson. I can display the popups of my layers but the large layers can not displayed and the computer is not responding.
what is the solution?
Related
I want to overlay my data-layer on top of the water but below the land surface.
But the problem is that there is basically no "ground" layer on mapbox layers. There are different layers like 'water', 'roads' etc layered on top of a background which is basically 'land'
I have been able to use 'roads' on top on my data which gives the following images. but is there a way to visualize my data only on 'water' and not on 'land'?
For more information. data is in geojson format. I have used movelayer() funtion of mapbox and checked by moving my datalayer below each layer of map.getStyle().layers one by one.
Also, can this be done in different styles available in mapbox?
To do what you're trying to achieve, you'll have to find another tileset of land polygons to use as a mask. There isn't a way to dynamically clip a layer to within the polygons of another layer, for instance.
I'm using Leaflet (with omnivore and the MapQuest tile plugins) to display a map with colored polygons. The map and polygons look/work fine, but there are these mysterious blue markers everywhere.
There's nothing in the JS about markers at all, and if I comment out the polygon.addTo(map); line, the markers disappear. So they're definitely related to the polygons, even though they're not directly positioned on the polygons.
Any idea why the markers are appearing, or how I can make them disappear?
SOLVED: It turns out that the problem was that I'm using MSSQL's ".Reduce(n)" function to simplify the polygons (for performance), and if you simplify the polygons too far, the results have "Point(...)" items in them - which leaflet renders as markers!
Now, off to figure out why MSSQL is turning things into points...
Welcome to SO!
Most probably your polygon variable is a Leaflet GeoJSON Layer Group built by the omnivore plugin, and the data you feed it with contains "Point" type geometries.
If you do not specify anything special to handle these points, Leaflet will render them with this default blue marker icon.
In that case, you could simply filter out those point features, whether after omnivore processing (use the ready event) or using a custom GeoJSON Layer Group with its filter option. There should be other posts describing such solutions.
See e.g. Mapbox: Filtering out markers in a Leaflet Omnivore KML layer
If you are not in this case, you would have to provide more information for people to be able to help you. Typically code that you use to build your polygon layer and sample data.
I am new to leaflet. currently I am working on leaflet to render vector tiles. my application's requirement is that on click i should get features from map tiles in geojson format.
In Mapbox map.queryRenderedFeatures(e.point). I want to do exact same thing, but in leaflet. Please check here to check how mapbox is fetching features.
Please help.
Current Leaflet implementation does not supports querying rendered features. Hence switching to Mapboxgl
I have created one QGIS map server for serving map as WMS or WFS feature.
As I am adding the layers in QGIS various thumbnails of QGIS is appearing which I do not want to appear in my map.
Same thing is happening when I am accessing those layers on web via Leaflet. Please help me how to remove these thumbnails.
I am attaching screenshots regarding this problem:
I am a bit confused about Tiles in MapBox. As I understood, a tile is a little piece of map, as in a jigsaw puzzle.
MBTiles are images, but they are connected to a database to read data & let interactions be possible. So if I move the mouse, I can show details of the layers under the cursor.
Vector Tiles store all the data in vectors, and they are just used for a fast rendering of the image. Interaction with such data is not possible.
Am I wrong?
Now, I see that there is the tool TileMill for MBTiles, and MapBox Studio Classic for Vector Tiles. I guess they are for different purposes; the first for interactive maps, the latter for fast rendering.
So.... why is TileMill not supported anymore, in favor of MBStudio?
Is it possible to make interactive maps with MBStudio as well?
Thank you
This is a great question!
mbtile is a filetype that can contain either raster or vector tiles. Think about it like an Adobe Illustrator .ai file -- it can either contain vector or raster data. Both raster tiles and vector tiles can be in mbtile format.
With TileMill, your vector data (shapefile, CSV, etc.) was combined with your CartoCSS style and passed to Mapnik to generate a bunch of tiled images. You could then store your tiles and feed them to a web map via a tile server. With Mapbox Studio Classic, you are converting your data to vector tiles and creating a CartoCSS style to style the data, but the image tiles aren't created until the map is requested via the browser. Ultimately, the output on the map is the same -- a grid of raster tiles.
The interactivity you created in TileMill with raster tiles is happening via a UTFGrid. This is an invisible raster layer that sits beneath the image tiles and adds interactivity to certain locations. The interactivity is not actually connected to any individual features at all -- it's just at the same location as your features. This is also possible in Mapbox Studio Classic, as the output in the map will also be a grid of raster tiles. You can read more about how to do this in Mapbox Studio Classic in the style quickstart guide.
So to answer your question, the move to Mapbox Studio Classic was to take advantage of vector tiles. They are a lot smaller than raster image tiles, and they can be styled on the fly, so, for example, you don't have to store two separate sets of images to accommodate retina screens. It also means you can have multiple styles applied to the same vector data on the fly, which means you don't have to regenerate a whole set of images for every style or every small change.
If the Metadata table contains a record format=pbf then the mbtiles is a vector tiles and not raster. mbtiles SQLite database can be a container for vector tiles which have in the Tiles table and tile_data blob field PBF -Protocol Buffers - protobuf ( https://github.com/google/protobuf – language neutral platform neutral mechasism for serializing structured data) Developed by Google. Tools like MapBox Studio build vector tiles from GIS Vector Data and databases