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.

Filter by
Sorted by
Tagged with
1 vote
0 answers
20 views

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 ...
  • 11
3 votes
1 answer
51 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 ...
  • 9,838
1 vote
1 answer
43 views

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 ...
  • 9,838
0 votes
1 answer
19 views

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 ...
0 votes
1 answer
59 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 ...
1 vote
0 answers
32 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 ...
3 votes
1 answer
73 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 ...
  • 10.4k
0 votes
0 answers
45 views

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 ...
1 vote
1 answer
104 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 ...
  • 75
0 votes
0 answers
40 views

How to overlay a raster image type to Google Maps in JS

I've got a Google Maps API on my web site like this: map = new google.maps.Map(document.getElementById("map"), { tilt:0 ,mapTypeId: google.maps.MapTypeId.SATELLITE ...
  • 466
2 votes
0 answers
54 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 ...
  • 167
-1 votes
1 answer
31 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 ...
1 vote
1 answer
43 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 ...
0 votes
0 answers
37 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. ...
1 vote
0 answers
44 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, ...
1 vote
2 answers
98 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 ...
1 vote
1 answer
92 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 ...
  • 411
0 votes
1 answer
98 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 ...
  • 17
0 votes
1 answer
186 views

Removing overlaps in QGIS

I want to remove overlaps in the picture below (showing trees). It doesn't matter which tree is cut, but I do want to keep all my attributes, because I need them later on. It is also important that ...
2 votes
1 answer
145 views

Create line from point to two polygon centroids that meet a condition

This is this is a follow up to this question I have in QGIS ver 3.22 two layers named: source_point_layer target_polygon_layer I want to automatically point with a line from the source_point_layer ...
  • 411
0 votes
0 answers
151 views

Removing overlaps from buffered line features in ArcGIS Pro

I know this question has been asked already but it seems that there is still no answer to it: My buffered streets shapefiles (which consists of many different segments/objects) overlay where the ...
  • 161
2 votes
1 answer
38 views

Creating overlays and calculating area of intersect

I'm currently mapping for deforestation and species risk from palm oil plantations. I'm trying to calculate the area of intersect between the individual species and p-oil plantations and deforestation ...
  • 21
1 vote
0 answers
27 views

Calculating percentage of classes of raster present in cells of larger raster using ArcMap

I have a Landcover raster layer at 25m resolution and would like to calculate the fraction of different classes within this layer present in each cell of a 1km resolution raster. The diagram below ...
  • 21
1 vote
0 answers
58 views

How to remove areas of overlap within the same layer in QGIS

I'm currently working with some data on soil survey areas in the US, and have run into a small issue when intersecting this data with another set of parcel areas. The problem appears to be that there ...
1 vote
1 answer
83 views

Set-Operations with Overlay when columns match

Lets go with the example at the geopandas Documentation. Say we have: from shapely.geometry import Polygon polys1 = gpd.GeoSeries([Polygon([(0,0), (2,0), (2,2), (0,2)]),Polygon([(2,2), (4,2), (4,4), (...
  • 305
3 votes
1 answer
366 views

Buffer Polygons without overlapping regions of neighbouring boundaries in ArcGIS Pro

I'm struggling with a simple buffer which turns out to be way more difficult than I thought. I just want to buffer a polygon shapefile which has many neighbouring objects (on the left picture the ...
  • 161
0 votes
0 answers
49 views

Overlay callout to empty space on map

Is it possible to make a callout on the Overlay / box to place on map it outside the coordinates, so that we use an empty space to place the overlay. This is because if we have several overlay ...
  • 11
1 vote
0 answers
251 views

Leaflet toolTip-display is a function of layer order

My map creates 3 Leaflet GeoJSON layers representing state, county, and town features collections. Each feature (in each layer) is bound to a tooltip by the onEachFeature option. The toolTip displays ...
  • 31
2 votes
0 answers
38 views

Style rule based on feature adjacent edges and ignore vertices

I have a set of square tiles which I want to show in a different colour when the tile to the north, south east & west are present in the same way as below with the links I want in black. I have ...
  • 21
0 votes
1 answer
130 views

How to overlay BLM map in leafletjs?

I'm trying to show BLM land areas overlayed on a map. I'm not sure how to define it though: const map = L.map("map", { center: [9.082, 8.6753], zoom: 8, }); ...
  • 101
1 vote
0 answers
159 views

Function for layering two rasters in R

I am trying to layer a raster over a hillshade raster in the same way that I would do using the base R plot function (example code below) and export as a GeoTiff. col_rmp <- c('#0180FF', '#0101FF', ...
  • 121
1 vote
0 answers
25 views

Polygon clipping with percentage tile membership

Let me setup the problem: I have a tiled world map (0.1° x 0.1°) with values assigned to each tile. I want to assign the values to each country, and I'm doing so by clipping to their ZEE mask. But ...
2 votes
0 answers
54 views

PostGIS ST_Split outputs without a split

I have a PostGIS workflow that has a line file that has been buffered then subdivided and a vectorized raster called myvector. My intention is to split or separate myvector based on the bounds of the ...
0 votes
1 answer
181 views

Choropleth layer selection does not work in Leaflet

I am designing a simple prototype web mapping application where I want a user to be able to click on a dropdown menu and have the map's choropleth layer, choropleth legend, and hover info box all ...
3 votes
1 answer
322 views

Access array of elements panel overlay using Leaflet

How do I get an array of elements (id, checked) that are checked in the panel? Example: I need the list of "talhão" that are checked===true. import React, { useRef, useState } from 'react' ...
  • 63
2 votes
2 answers
57 views

16 raster overlay/overlap

I need to overlay 16 black & white rasters to show their level of overlap. Ideally, as the output, I would want a new raster with a range of 0-16 (i.e. 0% overlap to 100% overlap). I tried doing ...
0 votes
1 answer
30 views

Is there a way to have all the outline to be in black after using "subtract" blending mode?

I have created a map of Central Africa which has two different layers: one layer shows the administrative boundaries of countries while the other one shows administrative boundaries of local regions ...
0 votes
1 answer
160 views

QGIS: Multi Overlay Analysis of NetCDF-4 Raster Files to Calculate Average Values over 5 years

Issue: I have a dataset that ranges from 2016 to 2021. The file types that I am going to use for the analysis are Aqua Modis and NetCDF-4. My data contains 650 rows and I am using parameters such as ...
2 votes
1 answer
178 views

Filtering in overlay_nearest

I am using QGIS 3.24, I have 2 polylines layers: First one is composed of 2 rivers, crossing. The two of them are named 1 and 2 Second one is composed of parallel lines form this rivers. 5 and 6 ...
  • 29
1 vote
1 answer
200 views

Loading several different queries in Leaflet overlays?

I am trying to make a map preview with different sensors, and I am not able to use different queries for different overlays. So my code is below: async function getdata() { const response =...
2 votes
1 answer
56 views

Find nearest start/end geometry to lines

I have two layers: 'markers' is a points layer and 'projects' is a a set of lines (orange in the map below). I need to create two attributes, Start_Loc and End_Loc in 'projects' which are the IDs of ...
  • 83
2 votes
0 answers
44 views

overlay_ expression functions with generated geometries

I want to use an overlay_ expression but not use the features' original geometries. Instead I want to use a generated geometry, e.g. their end_point(). The overlay_ functions operate using the current ...
  • 9,838
2 votes
2 answers
144 views

Some of the shapefile layer points still are outside of boundary even after correcting latitude and longitude

I have two shapefiles, one points and the other one polygons. These two layers should overlay without any points being outside of boundary. Unfortunately, there were some points that were outside and ...
0 votes
1 answer
227 views

WMS layer not visible while clicking Leaflet's grouped basemap layers

I have a webpage that adds Geoserver's WMS layer to the OSM basemap and also provide GetFeatureInfo on map click. The webpage works fine. The code was adapted from here. For the sake of tidiness, I am ...
  • 1,061
1 vote
0 answers
25 views

Renaming layer raster by overlay vector using PyQGIS [closed]

I split my raster .tiff into several rasters using a vector mask. Now I am wanting to rename those rasters by the id of the polygon used to split. How do I rename each raster by the id of the overlay ...
  • 31
3 votes
2 answers
802 views

Find and exclude polygons using GeoPandas

I have 3 dataframes: df1 (large polygons); df2 (small polygons, which overlays with large polygons) and df3 (points). How do I exclude large polygons in which points do not overlay with the small ...
  • 580
5 votes
2 answers
3k views

Find and remove overlapping polygons with GeoPandas

I have 2 data frames, let's say, df1 and df2. I need to find df1 polygons that overlay with df2 (the green line), and remove them from main dataframe df1. I do not need to extract a overlaying part or ...
  • 580
2 votes
1 answer
287 views

PostGIS: Split polygons into intersecting and non-intersecting and grouping on overlap

I have a big query that I am looking to optimize. I am matching millions (expanding daily) of rows with Points against a mostly read-only table of (tens of thousands of) areas with (Multi)Polygons. ...
1 vote
0 answers
330 views

Loading KML file in Google Earth that is too heavy to be opened directly: Is possible to be made a local KML or HTML file that emulates a WMS link?

I am trying to download a public layer because I have too many internet problems where I live now. I was previously working with this layer named "SEC_DistroTM" on Google Earth through an &...
  • 127
-1 votes
1 answer
840 views

Download online a public WMS layer as a Google Earth KML/KMZ that works without connection?

Are there any website online-converters to upload a WMS layer URL and convert it on a KMZ/KML file that works without internet connection? I am working with a specific WMS layers loading them to ...
  • 127

1
2 3 4 5
10