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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How to obtain superimposed colors from 3 raster RGB in QGIS

I have 3 separate raster layers with binary values (1/0). By assigning the 3 primary RGB colors to each of the layers, I would like to obtain a representation that expresses the overlap of the layers ...
Peter J.'s user avatar
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1 answer
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What is the right way to dissolve vector features in GRASS GIS on attribute values of one column summarizing or averaging others?

The line product of v.overlay contains a column with zones number and a stack of other attributes. What I want: Dissolve features (lines) on attribute column that contains zones number. Other ...
Nikolay Yasinskiy's user avatar
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Python Geopandas: Dissolve function does not dissolve overlapping polygons

I have developed a Python program using GeoPandas to handle overlapping polygons. The program first dissolves these overlapping polygons and then applies an overlay operation (specifically, ...
user2293224's user avatar
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How to select lines/edges that overlap with a line layer in QGIS

I am calculating the shortest path in QGIS using the openrouteservice API. From the returned route, I would like to calculate the length of segments that are paved and those that are not paved. Since ...
Faustin Gashakamba's user avatar
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Overlay shapefile boundaries on geom_tile heat map in R

I have a square matrix which corresponds to a square area of a map. The values represent the mean value of any centroids in the relevant grid square. I am visualising this using geom_tile in ggplot. ...
hwk2000's user avatar
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Combining bounding box with xy coordinates in R

I am just beginning a side project to start learning something about spatial analysis using data from match play events in a particular sport. I have some xy coordinates of shots taken at goal and in ...
Eccles's user avatar
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Is it possible to split a polygon-subwatershed with a gage point without v.overlay?

After creating a clean map of subwatersheds I want to split some where control gages are located. If I try to do this with v.overlay (AND) - clipping subwatersheds previously generated with r.basins ...
Nikolay Yasinskiy's user avatar
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Creating raster layer with pixel values which are sum of overlapping polygons in single vector layer

I am using QGIS. I have a vector layer with about 600,000 overlapping polygons, each with an assigned risk value as attribute. I want to create a raster layer which shows the total risk value at each ...
I'm not a robot's user avatar
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Image Overlay for Classified Images

I created 5 classified images for year 2019-2023 as shown: - Fig: Classified image of Sentinel-2 for 2019 I have also prepared the classified image for 2020, 2021, 2022, 2023 like above. The ...
Pushkar's user avatar
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PyQGIS: .disjoint() and .equals() do not work

I have to clean a data set for research. It is just one layer, but I need to remove features that are registered several times or have a geometry that is somehow faulty. The dataset is too large to do ...
Homerun_'s user avatar
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QGIS Overlay analysis in field calculator

I have a polygon layer in QGIS 3.32.2 which I want to clean for later analysis. There should be no polygons that share any area at all, but they would touch quite frequently. However, the polygon ...
Homerun_'s user avatar
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Set Operation `intersection` and return only one gdf

I would like to find all polygons that intersect and return the original polygons; not the intersection. Lets go with the set operation example from shapely.geometry import Polygon polys1 = geopandas....
arkriger's user avatar
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4 votes
1 answer
141 views

Merging two shapefiles to show boundaries

I need to draw both maps but only show boundaries for the region (blue map) over the district map (maroon). How do I do that without putting regions on top and changing opacity because the opacity ...
uganerd's user avatar
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QGIS value relation dropdown filter by overlay_nearest

I have in QGIS 3.28.8 two point layers: source_p and target_p I want in source_p layer to create a dropdown to "TargetFID" field with Value Relation to target_p layer with only 3 nearest ...
Rii Pii's user avatar
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Display only the features of a layer that are intersected by a dynamic atlas layer in QGIS

Is there a way for a layer (line) that has the symbology displayed dynamically by Atlas to determine ("filter") the symbology display of another layer (polygon) by intersection? Example of ...
Raphael Dias's user avatar
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How to know the origins of the result of shapely's symmetric_difference?

Suppose I have two line geometries: import shapely line1 = shapely.geometry.LineString([(0, 0), (2, 0)]) line2 = shapely.geometry.LineString([(1, 0), (3, 0)]) shapely.symmetric_difference(line1, ...
Felipe D.'s user avatar
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Controlling the grid_size in geopandas' symmetric_difference method

Operations in Shapely Suppose I have these two line geometries: import shapely link_12 = shapely.wkb.loads(b"\x01\x02\x00\x00\x00$\x00\x00\x00\xcc\xd4\x02\x96q\xb9-A\x8a+\xd1)\xda\x801A\xb1\xf3\...
Felipe D.'s user avatar
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Getting all layers hovered over in a layer stack in Leaflet?

Using Leaflet with a map that has multiple layers on it, how can i get a list of all the layers hovered over, a la ArcGIS Online? For example, suppose i have two circles A and B on a map in standard ...
Alex's user avatar
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QGIS - attribute(@atlas_feature) function in overlay filter

I am actually trying to make a QGIS style that match my current entity in the atlas. For this, I need to use : the functions overlay_intersects with one of my layer with filter the attribute value of ...
kgb61393's user avatar
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known contained polygons on geopandas return everything False for "contain" and "within" when dissolving one layer

I have two geodataframes: gdf1= 1000 polygons gdf2= 26 polygons that are bounding box of 26 polygons from gdf1. I would like to get the all the polygons from gdf1 that are not within gdf2. I decided ...
ReutKeller's user avatar
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Leaflet image overlay align with pixel coordinates on map

I have successfully displayed my image on a map at specific location using the bounds of a polygon. Here is the screenshot of the image displayed on top of map at around specific boundary bounds. var ...
Ahsan Mukhtar's user avatar
2 votes
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30 views

Assessing two rasters to identify areas where one species exists but not other using ArcGIS Pro

I'm re-learning ArcGIS Pro having not been in the GIS world for quite a few years (not since ArcMap). I have two vegetation species raster data sets and what I'd like to do is to find the areas where ...
Emily's user avatar
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How to join points for businesses with administrative shapefile and keep both points and administrative divisions on map

I have an administrative shapefile of Jamaica, and I have a layer with the coordinate locations of a few hundred businesses. I have spatially joined the business layer with the shapefile layer to ...
Matt's user avatar
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Creating 100m Buffer From coastline inward, for administrative municipalities in ArcGIS Pro

I am attempting to create a 100m Buffer from the coastline inward for the entire perimeter of Jamaica. I will be overlaying Landsat images over an administrative shapefiles. My end goal is to do ...
Matt's user avatar
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2 votes
1 answer
38 views

Add overlay to line geometries in symbology

In QGIS 3.22, I have a MultiLineStringZ layer with crossing geometries and I would like to represent either the Z component with overlay, or be able to order the geometries so that the last ones are ...
dmjf08's user avatar
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2 votes
2 answers
114 views

How can I calculate identifier TRAM field for this polylines

I would like to have any id field TRAM, together lines by group between 2 points, names (PE....). The idea is to write an expression using field calculator to get their id. The lines are always ...
Eduerst's user avatar
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2 votes
1 answer
295 views

Vector overlap analysis in QGIS

I'm in the search of the right tool to accomplish the following tasks: I have vector layer A,B,C and D. I want to overlay vector layer A with B, C and D. If, for example, vector layer B is overlapping ...
MrSalamikuchen's user avatar
2 votes
1 answer
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QGIS 3.6 on Mac: Extracting attribute value of polygon from another layer when it overlay

I have a layer labeled "Boundaries" with a set of polygons. I have another layer with a set of points labelled "Locations". The "Boundaries" polygons have an attribute ...
Toufik's user avatar
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1 answer
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Automatically plotting linestring flight path trajectories onto photos of the sky

Can anyone suggest how we would lay linestring flight tracks on a terrestial sky image (see below). The flight tracks are as geopandas linestrings. We want to do this for thousands of images.
Thirst for Knowledge's user avatar
3 votes
1 answer
273 views

GeoPandas Explode Multi-Polygon Holes Filled Inexplicably

I've run into an issue with the Geopandas explode method. When I run the explode method, multi-polygons which originally had holes are filled inexplicably. I need to expolode the multi-polygons in a ...
Joshua Croff's user avatar
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33 views

Union tool problem (QGIS 3.22)

I used the Union tool for land use change analysis (From 1990 to 2000) but somehow the tool didn't work properly. I've attached a screenshot (first image) to show the problem. There are many ...
Muhammad Firdaus's user avatar
1 vote
1 answer
142 views

Toggle Leaflet JS KML layers individually

I'm creating a map with multiple KML layers, and have been able to get the KMLs to appear, however, implementing a simple checkbox to turn each layer on and off is proving to be a problem. I've tried ...
John Spartan's user avatar
1 vote
0 answers
63 views

QGIS - Aligning Cells from Multiple Overlay DEM's [closed]

I am modelling a volcano with a changing landform using 5 overlaying DEMs at different stages of the volcano collapse. I need the cells of each DEMs to line up vertically so I can obtain elevation ...
Fitch's user avatar
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1 vote
0 answers
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Assessing overlaid data in QGIS [closed]

One of my research objectives is to evaluate the storm surge hazard map provided by a certain weather agency against the storm surge height and inundation of a recent typhoon (both in CSV format). As ...
Haibara's user avatar
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3 votes
1 answer
56 views

Is the geometric result of an intersection between two valid PostGIS polygons guaranteed to be valid?

If I have two overlapping PostGIS Polygon geometry objects, which are valid, is the result of an intersection operation between the two meant to be guaranteed to be a valid geometry? Obviously this ...
bugmenot123's user avatar
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1 vote
1 answer
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Is the geometric result of an intersection between two valid JTS polygons guaranteed to be valid?

If I have two overlapping JTS Polygon objects, which are valid, is the result of an intersection operation between the two meant to be guaranteed to be a valid geometry? Obviously this guarantee could ...
bugmenot123's user avatar
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1 answer
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Isolate pixels from trend raster in ArcGIS Pro

I'm using the generate trend raster tool (Mann-Kendall) and would like to isolate the resultant pixels from the sen's slope band that also show "significance" from the p-value band at the ...
b_squared's user avatar
1 vote
1 answer
1k views

Adding image overlay to Google Earth Web

I am trying to add an image overlay to Google Earth Web. It works fine in Google Earth Pro on my desktop, but I can't seem to make it work in Earth Web. I want to be able to have folders in my project ...
ceciliap's user avatar
1 vote
0 answers
73 views

Display Multiple Raster Grids as Triangles Instead of Squares

I am looking to show a negative correlation between two raster datasets (distance to nearest agricultural market and nighttime luminosity) and think it'd be fun to be able to show viewers the raw data ...
Vincent Armentano's user avatar
3 votes
1 answer
194 views

QGIS expression - overlay function, using overlay function as filter

I have a point layer with one field, id ranging from 0 to 9. I have a polygon that intersects some of the points, like so: My aim is to use an expression to get the intersecting point with the ...
Matt's user avatar
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Calculate percentage overlay of one polygon layer over grid then multiply percentage with associated grid values

I am overlaying a polygon layer with shapes representing cities over a 0.5 x 0.5 km shapefile grid. Each grid cell has an associated GDP value representing the entire GDP of said grid cell. The ...
digital-consolation's user avatar
1 vote
1 answer
223 views

Show element div collapse when click on map for `getFeatureInfoUrl`

I have a slide toggle that slides from right to left. I want when getFeatureInfoUrl is activated the result will be displayed in slide toggle and slide toggle automatically open. Now i was able to get ...
Jayzz's user avatar
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2 votes
0 answers
148 views

Creating Colorized Hillshade by Overlaying Hillshade and Color-Relief

I am trying to create a colorized hillshade using gdal and store it as a new file. I'd like to use the 'overlay' method (see also: Overlay) Unfortunately, it doesn't produce what I'd expect (which ...
Zev_Zide's user avatar
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-1 votes
1 answer
42 views

Finding features based on percentage overlap of another feature

I have a feature class of 'Firezone' polygons. I have a feature class of 'Area ID" The Area ID features are smaller than and overlap the Firezones. I wish to find all of the Area ID features that ...
Patrick John Lazaro's user avatar
1 vote
1 answer
485 views

Calculate intersect area for every feature in layer (ArcGIS Pro)

I have a .shp with multiple watersheds. I have a .shp with all the wetlands in the watersheds. I want to know for each watershed the area occupied by wetlands. So for watershed #1 there's Xkm2 of ...
Budgiebuda's user avatar
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0 answers
63 views

Matching two raster world maps which start from different longitude using QGIS

I'm trying to use the raster calculator for two different maps. But the thing is they start from different longitude like this, And I don't know how to fix the "not overlayed" area problem. ...
sangalee's user avatar
1 vote
0 answers
89 views

Overlaying rasters with different dimensions

I am new in QGIS. I have several (108) rasters (each one representing the global distribution of a specific species), I want to combine with a vector file representing different regions of the world, ...
waterdepth's user avatar
1 vote
2 answers
394 views

QGIS - How to split and display Population Data according to District/Province?

I'm a complete beginner in QGIS, currently self-teaching myself through Youtube. Current Problem: To split and display population data according to district/province Project Background: To measure ...
Senpai-C's user avatar
1 vote
1 answer
329 views

QGIS overlay_intersects in geometry generator if points are in polygon

I have in QGIS v3.22 two layers: polygon hex layer points layer I want to create a dynamic view when the points intersect on the polygon layer and fill the polygon content with some color and ...
Rii Pii's user avatar
  • 411
0 votes
1 answer
573 views

Extract values based on raster colour in QGIS [duplicate]

I have a shapefile layer of postal codes in The Netherlands. I also have a energy consumption colour map raster, with different energy types as different colours. I need to find a way of overlaying ...
Michiel's user avatar
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