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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92 views

Combining Data from raster and polygon

I am teaching myself GIS at the moment, and there are still some matters I haven't quite got the hang of. I'm using ArcGIS 10.1, and have three datasets: LAYER 1: A population dataset at a high ...
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116 views

How to delete overlay within the same feature class?

So, the following scenario: I have plenty of polygons that are within another polygon, all in the same feature class. All of the polygons (the one overlaping the other ones as well as the ones being ...
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61 views

In ArcGIS Modelbuilder: Mean value of different polygons within a buffered zone, weighted by area percentage

I am creating a model in ArcGIS model builder (10.2). I have buffered zones (polygons) and within these zones there are different soil types (polygons; Shapefile feature class). I have assigned values ...
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130 views

v.overlay in GRASS

As I understand, v.overlay module can be used for polygons overlapping processes. Polygon clipping, union processes can be done. There are many algorithms for these operations. Which algorithm is ...
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171 views

How can I remove feature selection from my layeroverlay in mapguide API?

I can add feature to my layeroverlay on mapguide API, but I don't know how to remove it. Can you help me find a method to remove a feature from a selection ? This is how i add features to my layer : ...
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3k views

Compare two rasters with raster overlay and replace cell value with variable

I want to compare 2 rasters and when there is a change from 2 to 1 create a new raster that replaces the cell where the change has been detected with the change variable. ## Finds Cells that have ...
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1answer
242 views

OpenLayers3 get feature request for more than one point in the same place

I created a map that brings up a popup overlay on click, the JSFiddle is here. The only issue I have now is if I have two points in the same location it. As you can see with the Birmingham point, ...
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1answer
74 views

Combining Get Feature requests within OpenLayers3 Overlay

I have a map which currently shows one feature of a layer in an overlay popup when you click on it, as per this JSFiddle. As you can see, it currently displays the address within the overlay. I am ...
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1answer
311 views

Merging OpenLayers3 overlay with a get feature on click command that closes

I have this JSFiddle that is working fine on its own to select cities in the UK. I have then taken this OpenLayers3 example and put it into a JSFiddle. I am looking to combine the two so I have a ...
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1answer
307 views

Projection bug between overlay and base layers

I am making a WebGIS application for a course and I am trying to integrate some nice base layers like OMS, Stamen, and Bing Maps with my overlay layers that are for Bolivia from a Bolivian map ...
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3answers
3k views

Extracting difference between two massive shapefiles using QGIS?

I have two massive shapefiles and I need to create a difference shapefile output between the two. I have a layer where I have satellite coverage (orange) and then a layer where I have high resolution ...
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1answer
278 views

Weighted Overlay Decimal Values for Evaluation Scale

I would like to do a weighted overlay of different raster datasets. I would like my evaluation scale to be from 1 to 10 with 0.1 as the incremental value. This way for example a criteria could have ...
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1answer
2k views

Overlay analysis of two raster by attribute?

I have two rasters (one showing land use and the other showing soil texture). I'd like to find the areas where there is a specific land use on a specific soil texture. Is there a way to overlay two ...
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1answer
7k views

How to open overlay content from leaflet popup

I am currently working on an interactive leaflet map. I managed to display markers from a database via php (create an array). Now I want users to create markers with a click on the map. To add a ...
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1answer
377 views

2 Legends in Leaflet

In Leaflet I want to add a legend when I turn on an overlay, then when I turn off that overlay I want the legend to disappear and when I turn on a second overlay I want a second legend to appear. I ...
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831 views

Reprojected Shapefile does not align with OpenLayers Plugin [closed]

I am based in NSW, Australia. I have a shapefile that when I underlay with the OpenLayers plugin (Google satellite), the shapefile is skewed despite all my efforts to correct it. I changed the ...
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1answer
3k views

Selecting raster data by location: for raster and feature class data

I have rasters covering certain spots in my environment, I'm looking for a way to extract the values which occur at locations which are defined by a selection of feature layers. I've tried with the ...
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1answer
903 views

I cannot override my WMS layer in Google Maps as a base

I can not override my WMS layer in Google Maps as a base: I have a WMS layer in Geoserver am using Openlayers to show them. Calling only works WMS layer: Here is my code, I am using using the ...
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1answer
551 views

How to combine Boolean and Fuzzy logic?

So I have a set of 5 Fuzzy Memberships and a polygon feature class, to which I already added a yes/no field. For the final map, I need to combine/overlay all Fuzzy Memberships and the rasterized ...
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1answer
586 views

Moving QGIS basemap by hand in order to achieve overlaying with point layer?

I am an environmental engineer and the aim of my QGIS 2.0 project is to visualize the results of a sewage water system inspection. In a first step I included the hoppers from a csv file and added a ...
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2answers
210 views

Why does my gpx layer go to the wrong spot even if they have the same CRS?

Help! I am a QGIS beginner with a big problem! I am trying to load a gpx file from Garmin into my map. The project CRS is WGS 84, and the incoming data is in CRS WGS 84. When I look at the bottom of ...
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2answers
911 views

OpenLayers: Strange Tiling Issue (Checkered, white and grey) when panning around map

So this strange tiling issue is only occuring when moving around the map. Some things to note: 1) You can see the markers, airplane icon, and flight paths. These are all overlays, where the actual ...
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1answer
239 views

Making a KML layer “always on”

Is there a KML tag or specification by which you can force a given layer (specifically, a screen overlay) to be "always on", in that there is no way for the user viewing the file to make that layer ...
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2answers
1k views

Transforming Google Maps overlay to fit Ordnance Survey projection

I am currently in the process of creating a map with some administrative boundaries on it. The base map I am using is an ordnance survey map 1:10000. I downloaded an administrative border as a .kml ...
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1answer
117 views

Stamp out and transfer values from one overlayed vector layer to another

I have a vector layer with administrative boundaries and another vector layer with postal code boundaries, which are more precise/smaller entities/objects. I now want to transmit the values of one ...
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22 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 ...
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2answers
56 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 ...
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0answers
21 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 ...
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0answers
32 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 ...
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1answer
61 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 ...
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0answers
28 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 ...
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37 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 ...
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52 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 ...
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419 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,...
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86 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 ...
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0answers
32 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 ...
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0answers
29 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 ...
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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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0answers
128 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 ...
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44 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
542 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
60 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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69 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 ...
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0answers
48 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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84 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 ...
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1answer
129 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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109 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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268 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
46 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....
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103 views

Problems with weighted overlay on QGIS for Mac

I am a beginner on GIS seeking to finish a suitability analysis. For this I was planning to use 'vector to raster' tools as well as a 'weighted overlay analysis' to find the most suitable areas. I ...