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.
363
questions
2
votes
0answers
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 ...
0
votes
0answers
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 ...
1
vote
0answers
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 ...
1
vote
0answers
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 ...
0
votes
0answers
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 ...
1
vote
0answers
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 = ...
2
votes
0answers
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 ...
0
votes
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 ...
0
votes
0answers
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 ...
1
vote
0answers
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 ...
0
votes
0answers
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 ...
1
vote
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!
1
vote
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 + ...
1
vote
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 ...
1
vote
0answers
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 ...
0
votes
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 ...
2
votes
0answers
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 ...
1
vote
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 ...
2
votes
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 ...
1
vote
0answers
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 ...
0
votes
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 ...
1
vote
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('...
0
votes
1answer
19 views
Translating one raster's contents closer to anotherās 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 ...
1
vote
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
0answers
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 ...
1
vote
0answers
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 ...
-1
votes
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 ...
0
votes
0answers
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. ...
1
vote
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 ...
0
votes
0answers
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 ...
2
votes
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 ...
1
vote
0answers
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 ...
2
votes
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 ...
1
vote
0answers
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 ...
0
votes
0answers
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 ...
2
votes
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 ...
0
votes
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, ...
0
votes
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 ...
0
votes
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 ...
2
votes
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 ...
1
vote
0answers
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,...
1
vote
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.
0
votes
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 ...
0
votes
0answers
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 ...
1
vote
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?
2
votes
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 ...
0
votes
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 ...
1
vote
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 ...
