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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0answers
24 views
Overlay png image onto shapefile in QGIS?
How can I overlay a png file onto a shapefile in QGIS? I loaded both into QGIS and then tried using the Georeferencer tool to assign coordinates on the png image but then I get stuck on overlaying the ...
1
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0answers
19 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 ...
0
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1answer
21 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?
0
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1answer
58 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 ...
0
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0answers
12 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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0answers
5 views
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 ...
0
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1answer
66 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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0answers
19 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 ...
0
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2answers
48 views
Reclassify a raster in R based on two rasters with the output containing over 1000 bands
I am trying to convert the outputs of a model into a raster based on both a temperature raster and a seasonality raster. I have over 2100 bands so ifelse statements aren't going to cut it.
An example ...
0
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1answer
55 views
Computing number of points in a raster grid cell in R
I have a country shapefile and a dataframe with coordinates of bird sightings. My goal is to "rasterize" the shapefile and compute the number of points within each grid cell. Specifically, I want to ...
2
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1answer
33 views
Calculate distance between buffer and geographic points for grouped subsets (and get tally)
The data I used can be found here.
After importing my data, I select a subset of points (Nest2017 in column type) to create 30 m buffers around:
library(dplyr)
nests<-df %>%
filter(type %...
1
vote
1answer
48 views
Using Statistics by category in QGIS?
I use the "statistics by category" tool from QGIS to learn what grain yields I got from different combinations of scenarios like:
Soil A + Hybrid A + Planting Date A = Yield n
Soil B + Hybrid A + ...
0
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1answer
56 views
Overlaying raster image with different geographic extent using ArcGIS Desktop?
I have two raster image i.e A & B of different geographical extent. A image have the large geographical extent with raster value of 1 whereas B image is cover the smaller geographical extent ...
2
votes
1answer
33 views
Zonal statistics on raster layers that intersect line
I have a line feature class of routes and a raster file with 12 unique values. I want to know how much cells of each value in the raster has that intersect with lines.
I've tried zonal statistics (...
0
votes
1answer
57 views
KML Screen Overlay - works on google Earth but not on ArcGIS
I've been trying various things to get this to work on ArcGIS Online for the past couple of hours, but have not been able to figure it out.
It works perfectly fine on Google Earth but ArcGIS Online ...
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1answer
44 views
Calculating wetland coverage/overlay over parcels of land? [duplicate]
I have two layers. Layer 1 has features that are property/parcels with area in acres. Layer 2 has features that are wetlands/bodies of water with area in acres.
I want to calculate the percentage of ...
1
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3answers
116 views
Spaghetti, meatballs, and the one-to-many problem
I am trying to use the Spaghetti and Meatballs overlay technique to create a fire history layer from Cal Fire FRAP's fire perimeter data. I am following the technique Dale Honeycutt describes in his ...
1
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1answer
170 views
Calculating area of overlap between two polygons in separate layers using QGIS?
I have 2 layers with 1-1 polygon. The polygons are overlapping.
How do I calculate the area of the overlap using QGIS?
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2answers
40 views
Polygons from different layers
How to create a map with polygons from all the different layers?
I'm using ArcGIS Pro and it does not have Overlay analysis tool.
0
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2answers
120 views
R: Reclassify a raster stack through the range of the quantiles of each layer. Generic quantiles function ; layer by layer
I have a raster stack that contains terrain bends extracted with different neighborhood windows "crosc_nxn" (e.g. 3x3, 5x5, etc ...).
crosc_nxn <- raster::stack(path.files.list)
> crosc_nxn
...
1
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1answer
113 views
Dynamically set mapview based on the overlay feature of L.geoJson coordinates in Leaflet
I want to dynamically setView of the map based on the overlay feature which I extract from L.geoJson in Leaflet. I tried using fitBounds, which doesn't seem to work. Here is the code snippet:
var ...
1
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0answers
15 views
Iterating over set of feature classes and spatial join to create only one output? [closed]
I have a feature dataset with 50-some odd feature classes (polygon) that all have fields that I need to spatially join to one feature class (point).
So in the end, I only want one object with all of ...
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1answer
25 views
Determining map overlay diagram origin?
I am trying to determine the origin of the popular map overlay diagram that shows a GIS as a stack of map layers connected by four vertical lines representing the geo referencing system.
Can someone ...
1
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1answer
70 views
calculation with raster and numeric values in Loop with R
I want to do some calculations with a list of rasters of lakes. Therefore I wrote a loop, which has so far worked fine when I only used rasters. Now I have calculations with rasters and numeric ...
1
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1answer
36 views
Fixed buffer remove overlayed area
I have a problem with a fixed layer.
I have to count accident by Link within 100m area.
When I use a Fixed Distance Buffer, there is a problem because some area is overlayed so they will count 1 ...
1
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0answers
75 views
Bing and Esri satellitary basemaps are misaligned by about 2 meters
Did you ever notice a shift (2 meters) between satellitary basemaps from Bing and Esri?
The problem basically arose when GIS technicians have to deal with drawings made in CAD using Bing basemaps as ...
2
votes
1answer
421 views
How can I superimpose a geopandas dataframe on a raster plot?
I have a geopandas dataframe countries with country polygons, and a raster dataset raster (read with rasterio). I've already aligned the two as follows:
countries = countries.to_crs(raster.crs.data)
...
1
vote
2answers
216 views
Finding overlay percentage between two polygon shapefiles
I have two layers that I am currently working with: 1. Parcels/property boundaries and 2. Wetlands
I am trying to determine the parcels that have 0 wetlands and then for the parcels that do have ...
1
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0answers
29 views
Extracting point attributes to polygon grid in QGIS
I have point data of endagered flowers found in a number of locations. Each location may have up to hundreds of flower
registrations.
I want to end up with a 1x1km grid colour graduated from the ...
1
vote
1answer
167 views
EPSG conversion and image rotation in folium
I'm using Python's folium library (which uses Leaflet) to display images over a map.
However, my original data uses EPSG:3035 and folium uses EPSG:4326 (WGS84). There is a rotation when converting ...
1
vote
0answers
47 views
Extracting Grids containing 50% polygons (from land use layer) using QGIS?
I have a vector layer of Parcels for a certain area. I need to make grids of 100m * 100m over the parcel layer and then extract those grids which contain 50% or parcels by area.
I am currently using ...
2
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0answers
44 views
How to georeference multispectral raster without loss of data
I am trying to align two rasters made of data captured during same flight, but with separate cameras (drone - onboard, and Micasense RedEdge) and two separate gps devices (drone and another one ...
0
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0answers
73 views
Adjusting Overlay of Google Satellite Base map and Parcel Boundary
I'm fairly new to QGIS and have bounced back between version 2.18 and 3.2. I've been unable to fix my overlaying issue regardless of versions, openlayers plugin, quickmapservices, and using XYZ tiles. ...
3
votes
1answer
120 views
R Overlay points and polygons with a certain degree of tolerance
Also asked here
Using R, I would like to overlay some spatial points and polygons in order to assign to the points some attributes of the geographic regions I have taken into consideration.
What I ...
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0answers
40 views
Aligning multiple images with different spatial resolutions
I am using 2 different satellite images that have different spatial resolutions. One of them has 1 degree and other has 0.25 degree resolution. I want to subtract one image from another. So I should ...
2
votes
1answer
79 views
Find overlay between polygons excluding boundary
I want to find which polygons in a spatialpolygonsdataframe overlay each polygon in another spatialpolygonsdataframe. I have tried to use the function over from the package sp and it works fine... ...
2
votes
1answer
427 views
Convert geohash to shape/kml
I have a requirement where I need to convert a set of Geohash to KML files such that they can be used as areas to plot data by overlaying on map.
Is anyone aware of an open resource which can help ...
0
votes
1answer
257 views
Geopandas Overlay and ValueError
I am trying to get an overlay (intersection) of two geodataframes of polygons, but it returns me a ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all(...
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0answers
344 views
Google Earth app KMZ overlay hidden by 3D tees and buildings
I've got a KMZ layer with an overlay layer in the <groundoverlay> tag.
I've got 3d buildings and trees in the overlay area, and they hide the overlay.
In Google Earth app it is not possible to ...
0
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0answers
249 views
Overlay density plots over raster in R
I am trying to put a density curve over a raster in R. I can plot raster in R using:
library(raster)
library(sp)
library(ggplot2)
library(rgdal)
MAT_FP_1 <- raster("grid.bil")
plot(MAT_FP_1, xlab="...
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0answers
126 views
geopandas geometry.within problem ValueError: Geometry column cannot contain mutiple geometry types
I'm trying to do an overlap of some lines with polygons with geopandas.
For a reason I don't understand, gpd.overlay(grid, hel, how='intersection') is not made for lines and polygons, so I'm trying ...
1
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0answers
33 views
ArcGIS: Get coverage of Polygon A in Polygon B
We have dissemination area (DA) units for a city [Polygon B], and shapefiles of all parks in the city [Polygon A].Polygon A overlaps Polygon B in some areas.
We initially wanted to calculate the ...
0
votes
0answers
9 views
Raster overlay based on similarity to point?
I have multiple survey points, and I want to match each point with a different point in space that is similarly based on 5 raster layers.
I understand how a raster overlay works, but I'm interested ...
2
votes
2answers
104 views
Why such a large difference between overlapping LiDAR DEM values?
Background:
Using Arc Desktop 10.5.1, I have been tasked with mosaicking two adjacent LiDAR rasters (I'll call them A and B). They were flown, processed and supplied under contract by different ...
1
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0answers
66 views
Percent of polygon area within multiple ring buffers using ArcGIS Desktop?
I would like to calculate the percent of area of polygons that are within multiple ring buffers of a number of points. The polygons are associated with a specific point so I would like the buffers to ...
3
votes
1answer
341 views
ST_RELATE - Intersect ignore shared boundary
Using postgis I am trying to find polygons that intersect, ignoring polygons that only have a shared boundary (edge).
ST_Relate(g1, g2, 'T********') is a standard intersection.
ST_Relate(g1, g2, 'TF*...
10
votes
1answer
3k views
equivalent of sp package's point in polygon / overing using sf
I am migrating code from sp package to the newer sf package. My previous code I had a polygon SpatialDataFrame (censimentoMap) and a SpatialPointDataFrame (indirizzi.sp) and I got the polygon cell id (...
1
vote
1answer
101 views
Geopandas overlay issue [closed]
I am trying to get an overlay (intersection) of two collections of polygons
in geopandas:
splits = gp.overlay(nhds, cts, how='intersection')
but result is very weired (see the picture below).
I ...
1
vote
0answers
80 views
QGIS 2.18 r.patch fails “Input raster map contains cells with NULL-value (no-data)”
In QGIS 2.18.16 with GRASS 7.4.0 (Windows 7, 64 bit), I am trying to create a composite raster layer from two nearly identical versions of a 3-band color geotiff that almost (but not quite perfectly) ...
1
vote
1answer
773 views
Assigning raster values to spatial point using R?
I have a SpatialPointsDataFrame and create a raster object. I assign each raster cell a value and like to extract that value for each spatial point. I.e. if a point lies within a raster, I'd like to ...
