Questions tagged [overlay]

A spatial operation in which two or more maps or layers registered to a common coordinate system are superimposed, either digitally or on a transparent material, for the purpose of showing the relationships between features that occupy the same geographic space.

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Add multiple overlay with React JSX.Element/ component with OpenLayers map 6

I try to show several overlay boxes at the same time, problem all overlay uses the same "Div" element, but when I create one for loop to create several Div elements then overlays on top of ...
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How to overlay BLM map in leafletjs?

I'm trying to show BLM land areas overlayed on a map. I'm not sure how to define it though: const map = L.map("map", { center: [9.082, 8.6753], zoom: 8, }); ...
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Function for layering two rasters in R

I am trying to layer a raster over a hillshade raster in the same way that I would do using the base R plot function (example code below) and export as a GeoTiff. col_rmp <- c('#0180FF', '#0101FF', ...
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Polygon clipping with percentage tile membership

Let me setup the problem: I have a tiled world map (0.1° x 0.1°) with values assigned to each tile. I want to assign the values to each country, and I'm doing so by clipping to their ZEE mask. But ...
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PostGIS ST_Split outputs without a split

I have a PostGIS workflow that has a line file that has been buffered then subdivided and a vectorized raster called myvector. My intention is to split or separate myvector based on the bounds of the ...
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Choropleth layer selection does not work in Leaflet

I am designing a simple prototype web mapping application where I want a user to be able to click on a dropdown menu and have the map's choropleth layer, choropleth legend, and hover info box all ...
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3 votes
1 answer
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Access array of elements panel overlay using Leaflet

How do I get an array of elements (id, checked) that are checked in the panel? Example: I need the list of "talhão" that are checked===true. import React, { useRef, useState } from 'react' ...
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16 raster overlay/overlap

I need to overlay 16 black & white rasters to show their level of overlap. Ideally, as the output, I would want a new raster with a range of 0-16 (i.e. 0% overlap to 100% overlap). I tried doing ...
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Is there a way to have all the outline to be in black after using "subtract" blending mode?

I have created a map of Central Africa which has two different layers: one layer shows the administrative boundaries of countries while the other one shows administrative boundaries of local regions ...
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QGIS: Multi Overlay Analysis of NetCDF-4 Raster Files to Calculate Average Values over 5 years

Issue: I have a dataset that ranges from 2016 to 2021. The file types that I am going to use for the analysis are Aqua Modis and NetCDF-4. My data contains 650 rows and I am using parameters such as ...
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Filtering in overlay_nearest

I am using QGIS 3.24, I have 2 polylines layers: First one is composed of 2 rivers, crossing. The two of them are named 1 and 2 Second one is composed of parallel lines form this rivers. 5 and 6 ...
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Loading several different queries in Leaflet overlays?

I am trying to make a map preview with different sensors, and I am not able to use different queries for different overlays. So my code is below: async function getdata() { const response =...
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Find nearest start/end geometry to lines

I have two layers: 'markers' is a points layer and 'projects' is a a set of lines (orange in the map below). I need to create two attributes, Start_Loc and End_Loc in 'projects' which are the IDs of ...
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overlay_ expression functions with generated geometries

I want to use an overlay_ expression but not use the features' original geometries. Instead I want to use a generated geometry, e.g. their end_point(). The overlay_ functions operate using the current ...
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Contour plot over a offline map

I am trying to plot a contour plot on the offline map. My contour plot is this: import numpy as np from scipy.interpolate import griddata as gd from matplotlib import pyplot as plt y = np.linspace(...
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Some of the shapefile layer points still are outside of boundary even after correcting latitude and longitude

I have two shapefiles, one points and the other one polygons. These two layers should overlay without any points being outside of boundary. Unfortunately, there were some points that were outside and ...
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WMS layer not visible while clicking Leaflet's grouped basemap layers

I have a webpage that adds Geoserver's WMS layer to the OSM basemap and also provide GetFeatureInfo on map click. The webpage works fine. The code was adapted from here. For the sake of tidiness, I am ...
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Renaming layer raster by overlay vector using PyQGIS [closed]

I split my raster .tiff into several rasters using a vector mask. Now I am wanting to rename those rasters by the id of the polygon used to split. How do I rename each raster by the id of the overlay ...
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Find and exclude polygons using GeoPandas

I have 3 dataframes: df1 (large polygons); df2 (small polygons, which overlays with large polygons) and df3 (points). How do I exclude large polygons in which points do not overlay with the small ...
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2 answers
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Find and remove overlapping polygons with GeoPandas

I have 2 data frames, let's say, df1 and df2. I need to find df1 polygons that overlay with df2 (the green line), and remove them from main dataframe df1. I do not need to extract a overlaying part or ...
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PostGIS: Split polygons into intersecting and non-intersecting and grouping on overlap

I have a big query that I am looking to optimize. I am matching millions (expanding daily) of rows with Points against a mostly read-only table of (tens of thousands of) areas with (Multi)Polygons. ...
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Loading KML file in Google Earth that is too heavy to be opened directly: Is possible to be made a local KML or HTML file that emulates a WMS link?

I am trying to download a public layer because I have too many internet problems where I live now. I was previously working with this layer named "SEC_DistroTM" on Google Earth through an &...
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Download online a public WMS layer as a Google Earth KML/KMZ that works without connection?

Are there any website online-converters to upload a WMS layer URL and convert it on a KMZ/KML file that works without internet connection? I am working with a specific WMS layers loading them to ...
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2 votes
1 answer
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Dissolving/merging overlapping polygons in shapefile but retaining a list of original attribute values in Python/GeoPandas

I am looking for an answer to this question, for overlapping polygons, but in Python and preferably with GeoPandas. Background I have files with up to 90'000 polygons, see Tab. 1 in the Minial Working ...
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1 answer
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Overlaying image with polygon shapefile in QGIS

I am using QGIS and I'd like to know how I can make this kind of image overlay using as base a polygon shapefile of my city's blocks, just like in the following images.
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Obtain most common type and assign to polygon - ArcGIS Pro

I have a small areas shapefile containing over 18,000 polygons for Ireland which I have classified in the attribute field as 5 different main land types in accordance with CAFE Directive using ArcGIS ...
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Map visualization based on occurrences of ZIP codes

I have an array of ZIP codes (from Poland) in CSV format. Some of the ZIP codes are repeated more often than the others. I would like to visualize them all on a map, emphasizing (with colors e.g.) the ...
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4 votes
2 answers
305 views

Numbering points per polygon group with QGIS expressions

In QGIS, I have a point and a polygon layer. I want to number the points ascending from left to right (from smallest to highest x-coordinate value - West to East). However, counting should be made ...
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3 votes
2 answers
150 views

Creating buffer (of line geometry) around polygon feature using QGIS

I have a polygon layer representing coastal cliffs and would like to create a line at a certain distance out to sea from this polygon layer (I drew a blue line on the image below to demonstrate). In ...
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What's the difference between LayerTiles, Overlay Maps, Maps, etc

I am currently learning leaflet and I see a lot of posts mentioning "Layer Tiles", "Overlay Maps", "Layers", "Maps", so I wonder, what the difference of these ...
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Compare two rasters and create a new raster with common and different values

I have two classified maps (1995 and 2000) with five classes (built up, vegetation, etc.). I want to create a new map that will have all the built-up pixels from 1995 and will only have pixels from ...
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2 votes
1 answer
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Duplicates Not Highlighted

Actually I am using Geometry Generator and a small script for displaying duplicate values in the data. But some duplications are not highlighted. Don't know why its happening. can any one suggest any ...
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How to Overlay the GeoTIFF file on Google Earh

I found how to open the GeoTIFF files on the Google Earth Pro from this site. However, though I followed the way, it just show white images on the Google Earth Pro like this: You can see three boxes ...
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How do I overlay one raster over another

I have two rasters on a postgresql database one is a map of the world and the other looks like a weather map. I have been trying to figure out how to overlay one map on top of another. What I have ...
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1 vote
1 answer
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Choosing which values to keep when merging rasters [closed]

I figured this would be a simple problem but I cannot seem to find the solution. I have two rasters as DEMs (digital elevation models). One is of the entire area of interest and represents the ...
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Color map from random raster in QGIS

I am trying to create a color map overlay of sound levels from a known source using QGIS (3.8). The results of the noise calculations come out as a raster in polar coordinates (NOT rectangular), ...
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4 votes
1 answer
108 views

Getting all of combinations of features found on two layers using QGIS

This is a problem that seems like it should be simple, but it's a little difficult to explain. I have two polygon layers, each with a few hundred features (specifically the districts of England and ...
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Why does Leaflet overlay display depend on baselayer selection? [duplicate]

I have a Leaflet map with a button that turns overlays, and overlay opacity control, on and off. Overlays are loaded transparently, can have their opacity adjusted and then can be collectively be ...
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3 votes
1 answer
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Split population number by area

So, I have a polygon that contains the population number. Another polygon is a zone polygon. I need to approximate population from the first polygon to zones polygon, but based on intersection percent....
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How do I add OpenLayers “overlays” using Vue.js

I can't figure out how to implement an OpenLayers "overlay" in my Vue.js app. There doesn't seem to be much guidance online about how to do this. The Vue component below gives me the map ...
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10 votes
3 answers
797 views

QGIS expression with overlay-fuction: filter-condition based on comparison of attributes from two layers

In QGIS 3.18, I have two point layers: layer_1 with attribute id_1 and layer_2 with id_2. I want to use the overlay_nearest function: overlay_nearest(layer[,expression][,filter][,limit=1][,...
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Cannot see or classify weighed overlay or weighted sum rasters using ArcMap

I ran weighed overlay and weighed sum on a suitability analysis in a model. neighther one is visible when added to display. The weighed sum values are also suspect (first pic). I go to properties, ...
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1 vote
1 answer
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Using over() function in R with Polygons and Raster

I want to calculate the average rain by region using the over function in R but I am getting the error "unable to find an inherited method for function over for signature RasterLayer, ...
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How to overlay vector grid to keep track of areas I have reviewed:ArcMap

I need to review large areas at the street level (in ArcMap) to make sure certain features are up to date. Is there a way to overlay a grid so I can "check off" areas I have already covered? ...
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1 vote
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Geopandas Overlay Union does not find all Overlaps

I am trying to union 4 polygons and want to know for each (sub)region, which of the 4 polygons are overlapping. My idea was to use geopandas.overlay(..) iteratively. The code looks like this: union = ...
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2 votes
4 answers
356 views

Seeking website to share map via link including KML\KMZ overlays (which include images)

I wanted to overlay historic maps onto current maps\satellite imagery to share with others. I overlaid them in the desktop version of Google Earth, and exported the layers as KMZ, but Google's MyMaps ...
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1 vote
0 answers
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Overlays using ArcMap

I am using ArcMap. I have a parcels layer and I am overlaying a soils polygon layer over it. I am trying to filter out only the parcels that contain at least 50% of their total area in the soils ...
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1 vote
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Visualizing overlay of 6 point data sets using ArcMap

I have a visualization question. Using ArcMap 10.6, I would like to overlay six point datasets in a way that synergies and differences can be quickly seen by people who have no idea about GIS ...
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2 answers
516 views

Loading GeoJSON data to Leaflet overlay?

I am trying to get GeoJSON data from an API URL to an overlay. Code; // - GET GEOJSON DATA WITH AJAX TO OVERLAY REGION - // // Get the data var regions = $.ajax({ url:"https://public....
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2 votes
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Generate N distinct colors which (alpha) blend in a nice manner when overlaying an orthophoto or a map

I have N polygons (let N = 3 for making it simple) to display onto a base map in an OpenLayers application (but this can also naturally be applied to other GIS softwares as well). For the moment, I ...
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