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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8 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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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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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
15 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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29 views

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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134 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
22 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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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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27 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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66 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
41 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
40 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
48 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
93 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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66 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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1answer
31 views

Extracting pixel values by overlaying polygons

I am trying to extract pixel values by overlaying polygons. I use a code after Patrick Grey (http://patrickgray.me/open-geo-tutorial/chapter_5_classification.html). When I masked the image with the ...
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93 views

Why does leaflet treat an svg file differently in an image overlay than a png file and how can I prevent this?

I have a vector graphic in adobe illustrator format (ai). I would like to partially (only some layers) display this graphic as a basic map. I exported most of the layers of this vector graphic as ...
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20 views

L.imageOverlay does not fit with tiles created with maptiler

I have a vector graThe files have the same size ratio and the same bounding boxphic. I would like to partially display this graphic as a basic map. I exported most of the layers of this vector graphic ...
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40 views

Raster Polygon Overlay Analysys

I have a fishnet polygon feature class and a land cover (40 categories) raster. Both cover a large area. I seek to: a) calculate the area of each land cover type category (40) inside of each Grid ...
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32 views

Difference tool QGIS shows too many Differences

After running QGIS Difference Tool, I get a lot of differences, but I don't know where they are coming from. The input files are almost similar... Input Image (overlay input almost the same, but from ...
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Display a HTML iframe on QGIS 2.18

I actually work on a project where I need to display an iframe of a little website (its role will be like an overlay) on my background. I did some researches and I found Composer where I can put HTML ...
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1answer
235 views

How to use ground overlay google map android for polygon area to fit the map image in it?

I have a park area that is not rectangle or a simple shape. It is just like polygon area. I could load sample image on it for testing, in my android app. There it is : mGroundOverlayRotated = ...
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Not all points overlain on raster map are showing up with R

Using R, I loaded a raster file (.tif) and overlaid points on the map. I have 46 points but only about half of them appear on the map. I can't figure out why other points are not showing up. Here are ...
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138 views

How can I overlay two raster without turning them in vector format in Python to get zone wise statistics?

I have two raster re-sampled and same extent one is elevation class raster from DEM reclassification classified in 10 zone with 500m interval and another is snow cover fraction raster has snow ...
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32 views

QGIS GRASS tools output has only “cat” column in attribute table - missing full attribute table

Using the GRASS Tools plugin in QGIS 3.10.2 with GRASS 7.8.2 I have imported a series of layers and used the "v.overlay.or" algorithm to "union" them. This has worked successfully many times and once ...
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32 views

v.overlay with empty layer [closed]

I'm writing a Grass Python Script (using GRASS GIS 7.6.1) for a project for university. Sadly, I never learned Python, so it's a bit tricky but so far I got everything done I wanted to. The Script ...
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45 views

Finding map zoom level on basis of image width & height or worldFile data or on basis of field area in Android

I am trying to render the satellite images on google map in Android, and I am able to do that but the issue is, some images are not getting rendered properly because of the zoom level. Every image ...
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2answers
98 views

GRASS r.mapcalc to replace null values

Is there a way to use r.mapcalc to replace null with 0? I tried if(isnull(map1), 0) but that produces a map that is entirely 0. I need only cells containing null to be altered!
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Multiply cell values during r.mapcalc in GRASS

I'm doing some sieve mapping in GRASS. I have several map layers containing various values representing site suitability ranks. I need to use r.mapcalc to add these maps together for example map1 + ...
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2answers
355 views

Overlay two raster GeoTIFFs using rasterio mask

I'm trying to crop two different geotiffs/rasters using a polygon with rasterio's mask function in order to get two corresponding/overlapping cropped numpy arrays of the same size/shape. The problem ...
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27 views

QGIS Plugin Overlay Analysis Stuck [closed]

I am a bit new in p\Pthon programming in QGIS. Now, I am trying to develop a QGIS Plugin about Suitability Analysis using Ordered Weighted Averaging process. So in brief, I want to make a plugin to ...
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1answer
60 views

Move and/or Remove Markers in ArcGIS Graphics Layer

I'm using the ArcGIS 100.6 iOS SDK and am populating the map with markers on a Graphics Overlay Layer whose locations are stored in a database common to all users of my application. Each marker is ...
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31 views

Overlay Map Visual on Shapefile

I am trying to display a map/shapefile of an NTS250k grid of Canada as shown in MS Power BI. BI requires to import the shapefile using .json format. I am just wondering if there is a way to be able to ...
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1answer
25 views

Transfer metadata related to Image overlay in Google Earth pro from one system to another?

I have been working on Google Earth pro desktop software and have overlayed many JPG images over it. Every time I close and open the software again, the images remain intact in there correct ...
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1answer
89 views

Aligning two maps with different projections in QGIS

I am trying to add historic borders to a modern blank world map. The files I have are all bitmap format and the historic borders are in separate regional maps (Africa, India, North America, Western ...
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37 views

Union multiple layers with OGRVRTUnionLayer

I'm trying to union overlay layers using OGRVRTUnionLayers. However, it keeps the new records on new rows as opposed to appending the data to the same row (So you would expect to get back all data but ...
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1answer
265 views

Google / Mapbox static maps displaying custom image with certain bounds

I have a process which generates a simple Google Static Map (can also be a MapBox static image as the code is pretty much interchangeable). It's recycled code from a project I found years ago. The ...
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1answer
235 views

Leaflet side by side plugin is not working with imageOverlay

I'm trying to use the side by side plugin. I already check in the issues and change the getContainter() with getPane() in the .js file. this._divider.style.left = dividerX + 'px' this.fire('...
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1answer
21 views

Translating one raster's contents closer to another’s with each at different scales using QGIS?

I'm working with multiple raster images, each in the Albers Equal Area Conic projection: one of the mainland US, one of Alaska, and one of Hawaii. I'd like to translate the Hawaii layer to be closer ...
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1answer
119 views

Split lines by polygons PostGIS

I have lines that I would like to split at polygon boundaries. The line table is MULTI and the polygon table is MULTI and was derived from a MULTILINESTRING table that was buffered then unioned to ...
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2answers
130 views

GeoPandas sjoin with extensive quantities

I have one geodataframe that contains polygons and corresponding land use category (e.g. agricultural, commercial, retail, residential, ...) and another that contains census tract polygons and ...
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2answers
132 views

Performing identity operation in PostGIS?

I would like to perform spatial identity operation (ArcGIS example here) using PostGIS. I have two polygon tables, one of which is the input layer and the other table is the overlay layer. The output ...
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13 views

Subtracting features from one layer using another layer in ArcGIS Desktop? [duplicate]

I have 2 layers of land parcels for a particular area (shown on top of each other like so): The darker parcel lines and road polygons are from an earlier parcel map. The land has been developed and ...
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31 views

Set-overlay collection of polygons on itself [closed]

I have a GeodataFrame in Geopandas, that consists of a number of polygons, each overlapping its neighbors. What I want is to generate every single possible polygon from all the intersections, so that ...
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2answers
233 views

Finding overlay/intersect shape percentages using QGIS? [duplicate]

I am working on a project in which it's necessary for me to overlay 2 layers (a map of precincts and a map of census tracts). I need to be able to determine the %area of each census tract covered by ...
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2answers
94 views

Adding information to polygons inside polygon from other polygon in QGIS?

I have two layers in QGIS. The first one contains buildings and the second one contains blocks. Now I want to add the ID of the block to all buildings inside this block. Are there any functions in ...
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1answer
1k views

Overlaying satellite image tileLayer over OpenStreetMap in LeafletJS?

I am currently creating a web app for visualizing disaster impact via satellite imagery. I have satellite images (.tif) which I need to overlay over OpenStreetMap. Since .tif file is very large, I ...

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