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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1answer
240 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 ...
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0answers
19 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
29 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 ...
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1answer
145 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 ...
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1answer
41 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 ...
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0answers
110 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 ...
4
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1answer
2k 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) ...
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2answers
514 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 ...
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38 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 ...
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1answer
433 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 ...
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0answers
56 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 ...
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0answers
91 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 ...
3
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1answer
164 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
61 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
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1answer
190 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
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1answer
728 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
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1answer
376 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(...
5
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1answer
139 views

How to assign (or project) CRS to LiDAR file in lidR?

Can someone enlighten me if there is a difference between initializing a CRS object using the EPSG code versus just the +proj string read from a shapefile? Consider the following objects: A ...
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0answers
477 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 ...
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0answers
187 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 ...
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0answers
47 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 ...
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2answers
145 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 ...
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0answers
82 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
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1answer
693 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*...
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1answer
6k 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 (...
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1answer
123 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 ...
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0answers
100 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) ...
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1answer
1k 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 ...
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2answers
5k views

Defining which layer (overlay) is displayed on Leaflet map?

I have 7 layers overlay on a base map, i need to define which layer is selected (active,displayed,shown) on the map. var overlays = { "AL HOUDA Espaces_Verts": alhouda6_layer, "...
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0answers
240 views

Imagemosaic no-data pixels problem transparency [closed]

I'm trying to display imagemosaic where image are irregular and near each other. Imagemosaic are displayed with a SLD Images overlap and no transparency is applied When publish imagemosaic, I set ...
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1answer
403 views

Overlaying a .png image that comes with a world file in UTM with OpenStreetMap data?

I have received a geocoded .png image (2380 x 2396 pixels) that comes with a world file containing georeferencing information in UTM format: worldFileParams = [0.5,0.0,0.0,-0.5,690920.0,5335407.5] ...
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2answers
653 views

An image on top of the marker with Leaflet

How can I achieve the same result (image below) with Leaflet? L.imageOverlay() only can supply one image, and the image size is based on (lat, lon). But what I need is the image size the same as the ...
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1answer
2k views

Extracting data attributes from SpatialPolygonsDataframe and put into dataframe using R?

I want to extract all the data attributes from my SpatialPolygonsDataframe, including the ID of all polygons. The reason I want to do this is the following. I have a SpatiaPolygonsDataframe (which I ...
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1answer
159 views

Calculate overlay area - QGIS (Essen)

I have create a layer that is the represents the overlay areas based on some condition. The overlay is represented in purple: I want to know the area of the overlay - which is a separate layer that ...
2
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1answer
366 views

Rasters in R - merge taking mean, excluding NAs. Overlay and Mosaic both giving funny results

I have a series of raster images, all derived from LandSat data, which give pixels a value of 1 if they are predicted to contain water, 0 otherwise. Many of these images are from the LandSat 7 ETM+ ...
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1answer
30 views

Geotiff downloaded with same coordinate system don't overlap [duplicate]

I am a beginner usign ArcGis, i downloaded two geotiff with the same cellsize and with the same GCS ( GCS_WGS_1984) but it seems that the two images don't perfectly overlay. Looking at the extent of ...
3
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1answer
101 views

Define precision in geometric predicate methods in PyQGIS

It is possible to define precision for geometric predicate methods, such as: intersects (), contains (), equals (), touches (), overlaps (), within (), crosses() For example, I'd like to set the ...
11
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1answer
472 views

Creating a Radial Sector Overlay in QGIS

I need to create a sector grid radiating out from a point of interest. Here is an example that I laboriously put together by hand: I have found a couple of similar solutions in How to generate ...
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2answers
111 views

Using Overlay Analysis (e.g., Union) with point data (point shapefile)?

Is it possible to compare a point shapefile with a DEM raster in which the Aspect tool has been applied? I am reading about Overlay Analysis but cannot find a definitive answer. The attached photo ...
2
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1answer
488 views

Combining overlapping polygons and their attributes using ArcGIS Desktop?

I have two global polygon features (layers). One is the highly detailed country shapes GADM (Global Administrative Areas) and is overlapping the less border accurate TDWG (World Geographical Scheme ...
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1answer
80 views

Create light overlay from heavy shapefile to use in web app

A question about soundness of principle as much as method, as I am very new to the subject. Having to serve over web the polygons in way too large a shapefile (200Mb), I am wondering: could I, with ...
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1answer
69 views

ABC of serving large amounts of data / shapes?

Some background: web developer, with some experience of Google Maps, currently developing a fairly complicated tool for archeological studies. Outside of Google Maps, I have little to no knowledge of ...
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1answer
364 views

Multilines appearing on map but ordinary lines are not

I'm trying to achieve two things: 1) Display lines on a map and 2) add pictures to a map. 1) I've successfully displayed multilines on a map using the Leaflet.js library. For some reason lines are ...
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1answer
29 views

Finding Vector data that is in the area of a specific value of Raster data

I am doing a flooding analysis and would like to know how many roads would be flooded at certain elevations. The roads are in vector data format, while the elevation information is in raster. What ...
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1answer
156 views

Using WFS Vector layers in OpenLayers?

I have some code in loop: var vector = new ol.layer.Vector({ title: name, style: styleFunction }); ...
5
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1answer
822 views

Difference between lines and polygons using geopandas

I wanted to geopandas.overlay() on lines and polygons : get the geometries from the lines that are not in the polygons. I tried using geopandas for this : result = gpd.overlay(my_lines, my_polygons, ...
1
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1answer
43 views

Attributes of polygons in a shapefile based on largest area intersection with polygons from a different shapefile [duplicate]

I have a shapefile of landcover. It was developed from a raster dataset (the Crop Data Layer). I also have a grid of 50x50m cells (polygons in a shapefile) I have overlain on the landcover shapefile....
3
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2answers
2k views

Overlaying re-projected points and polygons in R?

I am trying to overlay point data with polygons in R in order to find the polygons which intersect with the points provided. The assciated prj file from the polygons shows their coordinate ...
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1answer
417 views

How to make Openstreet Map transparent now;

I have a detailed DTM of my region and i want to overlay Openstreet Map with transparency. Is this possible and how; I work with Openlayer3
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1answer
932 views

Is there a way to use the over function in r to retrieve all polygons that do NOT have points in them? [duplicate]

I have used the over function to retrieve the polygons of a map that contain points. I'am wondering, for my own learning purposes, if there is a way to use the over function to retrieve the polygons ...