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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22 views

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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118 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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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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46 views

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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41 views

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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26 views

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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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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33 views

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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Raster overlay without loosing original information

I have been an active ArcGIS user but now moving to QGIS but i miss a tool that allows me to overlay/intersect raster layers e.g soil classes, slope classes, landuse classes but still main this ...
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309 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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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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Does it make sense to compute overlap between standard distance circles?

I have two layers: Points showing locations of field camps across a region Points showing locations of study sites across the region I have these for multiple years and want to map how the spatial ...
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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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264 views

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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Overlay Vector Layer on 3D model built from another Vector Layer

I have 2 vector layers. One vector layer has data that I built a 3d model from. I built a choropleth from the other vector layer. I want to overlay the choropleth layer onto the 3d model built from ...
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103 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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25 views

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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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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Retaining input information with raster overlay

I'm working in ArcGIS (version 10.7) on an unweighted overlay analysis of 15 green space functions that I would like to tally but also still retain the information for which functions are represented ...
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113 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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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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1answer
185 views

Finding overlapping polygons of two Spatial Polygon Data Frames using R

I am new to GIS and GIS in R. I have two Spatial Polygon Data Frames (spdf), one contains the marine ecoregions of the world (MEOW), the other one contains Exclusive Economic Zones (EEZ) of the world. ...
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1answer
64 views

Detecting automatically where rivers flow, directly into the sea or into another river

I am using this dataset of rivers in France. I'd like to automatically distinguish between rivers flowing directly into the sea versus rivers that flow into another river and draw a map of only those ...
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36 views

Merging overlapping thematic rasters using ArcMap

I want to merge two overlapping rasters. Raster A has 8 classes and raster B has only 1 class. I would like to produce Raster C with 9 classes, where Raster B would overwrite corresponding pixels in ...
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116 views

Use field calculator to check for intersection

Ultimate goal I plan to retrieve attributes from layers using the field calculator where they intersect with a geometry. Current step Checking whether the current $geometry intersects with the layer ...
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38 views

How to get the overlap parts of polygon features in a same layer by QGIS?

I have a polygon layer, some features are overlapped. I want to get the overlapped part(s) and save them to another feature. For example, 1 polygon(0 0, 2 0, 2 2, 0 2, 0 0) and 2 polygon(1 1, 3 1, 3 3,...
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45 views

Overlap area of features from same feature class

Is there a way to calculate the area of overlap between features (polygons) from the same feature class. See figure below as illustration for example. There are 3 features with an ID and area and I ...
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1answer
75 views

Adding a tooltip overlay /eventListener to OL map when / for scrolling

I would like to fully implement Google Map API-s solution in Openlayers. I activated the ctrl+scroll zoom, but the poor user cannot know how to zoom now, and the nicest solution would be this: https://...
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Is it possible to prevent Google Earth to set 3D buildings ON with a KML tag on the file that I'm opening?

I often generate a KMZ file with an overlay that, in Google Earth, appears like this: The cut on the raster image are caused by this setting on Google Earth: I wonder if there is a way to prevent/...
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22 views

Overlay layers on different displays from the same coordinate system

I have vector layers from digitizing in Google Earth and vector layers from digitizing of a pdf document. All the layers were projected in the same UTM zone 30N system (EPSG code 32630). However, ...
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117 views

GeoPandas Overlay Intersect not intersecting some areas

I have a GeoDataFrame where I want to get all intersection between the polygons comprised in it. The cope i use for this is this: intersection_list = [] for index in input_gdf.index.to_list(): # ...
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Update graphic on Graphic layer with new Geo point (new current location)

We have migrated ArcGIS library from 10x to 100.9.0. In our App we have the functionality of change mock location using long press. Below is the code snippet of 10x which is working fine. Graphic ...
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25 views

Adding temporal attributes of larger polygons onto many smaller overlaying polygons

I am currently working with rainfall data on a large grid layer and want to transfer the data onto smaller grids. In the image below the large blue polygons currently have the data stored in them and ...
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161 views

Adding multiple ground overlays to Google Maps API to toggle with checkmarks

I found this answer here by user @hoogw very useful regarding Overlaying ArcGIS REST API on Google Maps. I've been trying to add several layers to be toggled by checkmarks to no avail. The base URL ...
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Clipping common overlapping regions in multiple trajectories

I have 20 trajectories I found a method on Github https://github.com/wisaaco/MatchGPX. The method's output is shown below. There are two GPS traces one in blue and other in Red. The overlapping ...
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Assigning attribute by location for multiple layers

I am trying to assign values by location of one of my polygon layer. It is overlayed by multiple polygon layers and I want to assign the value of the layer that covers it the most. Is there a tool or ...
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24 views

How can I get an average value for area using 30 different vector shapefiles as input?

I have 30 different vector boundary polygon shapefiles for a study area that don't exactly match up. Each polygon has a risk score. I want to overlay all 30 maps into a single map that represents ...
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1answer
38 views

Viewing Rasters on Phone/Tablet with GPS Location?

I have a Geotiff like the one below, and I'd like to be able to use it as a map I can view with my location on a table or smartphone. This can be via Google Maps or any other app. That is, I can use ...
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Orthoimage to EPSG:4326 - WGS84

I'm developing glrpt software for reception and decoding satellite images. We already have code that performs fixing of tangential scan distortion (see here for algorithm description). I suppose that ...
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181 views

Changing blending of contour label to multiply

I would like to label my maps like these in QGIS (image created using Photoshop): Image of contour label being shown on the contour lines with with white halo and then the colored raster layer above ...
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1answer
34 views

Reading heat map at point in QGIS [closed]

I have created a set of heatmaps based on the amount of certain chemicals released at specific sites in an area using the QGIS heatmap plugin. I now have a CSV of patient locations that I have ...
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166 views

How to overlay and combine a choropleth and a shaded raster in Python?

I want to make a choropleth map of regions but shade it according to local population density. This is not the problem of masking a raster with a shapefile but to overlay two representations of data ...

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