Geographic Information Systems

Questions tagged [overlay]

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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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15 views

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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76 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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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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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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38 views

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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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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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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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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2answers
70 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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68 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
59 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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30 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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1answer
98 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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36 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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32 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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62 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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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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Do all my layers need to have the same pixel type and pixel depth for an overlay analysis?

I am doing an overlay analysis with different raster layers, that were once polygons, and some original raster layers. I have resampled all my layers to have the same cell size or resolution, and now ...
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1answer
24 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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Adjusting same CRS to overlay raster satellite image with vector data

I need to overlay my raster image of chollian satellite with shape file of South Korea. It worked in MODIS images but it does not work in chollian satellite images. Could you let me know how to solve ...
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1answer
80 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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43 views

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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314 views

Shapely WKT dumps and loads does not always preserve rounding_precision

Shapely's WKT loads and dumps can be useful for rounding overprecise geometries, as pointed out here (Rounding all coordinates in shapely?) and here (Geopandas [Shapely] spatial difference: ...
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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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54 views

Overlay raster maps with GDAL

I have 2 raster maps both with the same size and projection etc. One map is some kind of base map (jpeg format) and the second map is an overlay that adds something (border lines, points...) to the ...
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1answer
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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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1answer
163 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
24 views

How to read a heat map at a point in QGIS?

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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118 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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1answer
69 views

How to determine the individual slope values of GPS point features in ArcGIS Pro

I have created a geodatabase raster displaying the slope of a region's terrain and have a number of GPS points which I uploaded into ArcMap (using the GPX to features tool). The points are locations ...
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1answer
279 views

Function to sum by pixel order in R

I am trying to quantify the number of months required to reach a specific value at the grid level. For this, the monthly raster values were then ranked, and the time length was defined as the number ...
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1answer
100 views

Error in overlay - formula not vectorized

I've run into another error while trying to get my predictive model to work. My base model is basically done (extracting locational parameters from archaeological sites in an area, and calculating a ...
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1answer
464 views

Overlaying shapefile layers in R [closed]

I'm very inexperienced in using R for GIS. I looked at other posts but couldn't find an answer. I'm trying to create a map that shows a municipality, roads through it and shop locations. I've ...
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1answer
120 views

How do I get the country codes from polygons in my “grid data” polygon dataframe?

I am relatively new to working with spatial data in R. I have two spatial polygon data frames. The first one is a shapefile which has a grid structure of a resolution of 0.5*0.5 for the whole world. ...
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1answer
114 views

How to change layer’s CRS in order to buffer and intersect in QGIS?

I'm very new to QGIS (working with version 3.12). I'm trying to create a buffer of rail lines, but it's coming out much larger than it should be, e.g. when I try to show a 500-ft buffer, it results in ...
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1answer
142 views

Display shapefile data - Leaflet 1.4.0

I'm a new member and a beginner with Leaflet and JavaScript. I try to display shapefile data on my webmap with Leaflet. But it doesn't work. All the data (.shp, index.html... ) in WGS84 are on my ...

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