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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29 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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17 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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39 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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30 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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24 views

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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62 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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37 views

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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1answer
58 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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25 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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27 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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25 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
53 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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2answers
18 views

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
143 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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23 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
30 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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28 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
20 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
61 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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35 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
134 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
143 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
19 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
76 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
88 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
115 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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29 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
140 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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27 views

How to select SpatialPoints inside the SpatialPolygons

I have two documents. One is a csv file which contains lon and lat information. Another is a shapefile. I want use "over" command in r to select points inside the polygons, but I get all NA results. ...
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2answers
72 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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23 views

Coordinate system problem; two features won't match up (linear units problem?) [duplicate]

I have two features that should overlay, both are shape files and one is polygons and one is polyline. The line should essentially outline a specific region in the polygons, but they are completely ...
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1answer
745 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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42 views

Imported CSV point data layer invisible over the raster map layer, though each layer shows good separately “zoom to content” [closed]

I am trying to import CSV file (comma delimited text) and get no reported errors but there are no points data visible overlays over raster data map 1. QGIS 3.6 2. the point data layer over raster ...
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1answer
135 views

KML file with multiple ground overlays

I have geolocated imagery which I would like to plot in Google Earth. I have the 4 corner points of each image, and I am currently laying the images down using GroundOverlay and gx:LatLonQuad. My ...
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62 views

QGIS: habitat suitability/combining raster layers

I have created a number of raster layers for different environmental factors (slope, roads, rivers, forest cover) and want to combine them to find areas where the 'ideal' aspects all overlap. For ...
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22 views

Clip OR Overlay in ArcGIS output feature empty

I use the Clip and Overlay to deal with download data. But they do not work and result in failure. Maybe the data is too large for ArcGIS Desktop to calculate. I do not know where I can check whether ...
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2answers
1k views

Averaging overlapping rasters with gdal

I am working on creating a class which will merge several georeferenced rasters into one using different strategies, essentially taking average, max, min where the images are overlapping. So far I've ...
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1answer
35 views

Rotating around arbitrary point, not center when using Google Earth Pro to Edit Image Overlay?

In Google Earth Pro "Edit Image Overlay", we can rotate the overlay around its center (via grabbing the green diamond,) but how might one rotate it around an arbitrary point not its center? (Yes, ...
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1answer
275 views

Enlarging/shrinking while maintaining aspect ratio when using Google Earth Pro to Edit Image Overlay?

In Google Earth Pro "Edit Image Overlay", the only way I have found to enlarge or shrink the overlay while maintaining the X:Y aspect ratio is to grab one of the four green corners (not the four ...
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0answers
50 views

Leaflet image overlays and iOS 12: partial rendering

My PWA (using Leaflet 1.5.1) is currently running (since 2 years) on Android and iOS without problems, until iOS 12 was released. From that point on I have very weird issues on iPhone and iPad. Main ...
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2answers
344 views

OpenLayers overlay bubbling problem

Regarding on the previous question asked https://gis.stackexchange.com/a/303372/119333, solution from best answer is implemented and its working. I am rendering tab panel inside popup overlay and you ...
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507 views

Setting bounds for image overlay in Leaflet

I'm using LeafletJS map. I need to use an image overlay. I have done it like so: onMapReady(event: any) { this.layers.push(imageOverlay(this.imgSrc + "map.png", [[35.334847, 25.328072], [35.337847,...
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1answer
75 views

Getting Canada shapefile to overlay model on QGIS?

How can I get Canada to overlap with the rest of my map? I think this is a CRS problem but I really do not know how to solve it.
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1answer
198 views

Image Overlay 3D Adapt in Google Earth

When adding an image overlay (specifically a GeoTiff exported from QGIS), the image looks great until you turn on 3D buildings or terrain. These features pop through the image overlay, and disrupt the ...
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161 views

Creating a Leaflet Overlay from JSON

I am trying to make an interactive map using leaflet where the user can toggle an overlay of multi-polygons. So far the following code works using a checkbox to display dummy point data, and radio ...
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1answer
26 views

How can I get common points of different point shapefiles in ArcGIS? [closed]

I have different data sets (point shapefile) and how can I get common point points of these shapefile in ArcGIS?
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2answers
79 views

Raster Calculation with 2 Raster Layers [closed]

I am attempting to create a new raster layer based on the values of one raster layer using a formula that is conditional based on the values in another layer. Two source layers: > ndvi class ...
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1answer
98 views

CAD data not overlaying in ArcGIS, but has correct coordinates in AutoCAD

I received a set of drawings that were drawn in millimetres but in the correct coordinate system; I use GDA94 with my coordinates in metres, so this should theoretically be a simple fix using my usual ...
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0answers
103 views

PyQGIS overlaying raster image on vector map correctly?

I have some code written in Python using PyQGIS where I am trying to overlay a raster image gridded with coordinates on to a vector shapefile map with the same coordinates. However, when overlaying ...

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