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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12 views

Trying to display a line grid in Massachusetts [closed]

I am currently attempting to make a line grid that overlays a Massachusetts Town Boundary shapefile. When I set the extents based on the coordinate number, it keeps being displayed in the ocean around ...
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22 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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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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33 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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56 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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21 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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18 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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27 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
17 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
55 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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32 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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66 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
96 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
61 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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74 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
107 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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28 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
97 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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24 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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68 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
510 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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37 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
93 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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52 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
670 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
27 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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168 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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44 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
253 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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417 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
65 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
147 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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132 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
21 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
75 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
85 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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86 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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1answer
129 views

Ordered weighted averaging error QGIS

I am trying to use Ordered weighted averaging to sum up values across different raster overlays in QGIS 3.4.4, but I get this error: Traceback (most recent call last): File "C:/PROGRA~1/QGIS3~1.4/...
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32 views

Using Interactive Overlay to Export Geographic Coordinates

I can barely spell JavaScript, but I have envisioned an application working with or embedded in Google Earth that employs the following work flow: This application is intended on working at scales of ...
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1answer
212 views

GeoPandas Overlay Symmetric Difference: How to get the upper polygon

I have the following code which get the difference of a pie wedges. c= gp.overlay(a,b,how='symmetric_difference') How to get the upper polygon?
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4k views

OpenLayers 5 add multiple markers

I'm using OpenLayers 5 to show a map and add markers to it. I can see the map without any problems but only the last marker is shown. I saw an answer about using .clone() method on the marker that's ...
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26 views

Raster Weighted Overlay Terminology

In a Arcmap raster weighted overlay, if an input data set is designated as "restricted" will overlay calculations not be performed on the "restricted" areas, and those areas will be included in the ...
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gdal2tiles.py output tiles changed on new install. geodetic image overlay shifted

given a global coverage image at .04 deg from 60N to 60S and -180 to 180 I previously generated tiles for google overlay using gdal2tiles.py once I determined the right syntax/args to use. The image ...
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1answer
209 views

Counting number of polygons within polygons using R?

I have two huge shapefiles. One contains polygons of one kind of vegetation and the other one representing a grid. A situation as follows but, of course, much bigger: I need: the efficient way to ...
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29 views

GeoServer-Mviewer : point layers over surface layers

I am working on an interactive map designed under Mviewer package and using GeoServer to save symbols and layers. I have a specific issue on it: I managed to generate all layers correctly in my ...