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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75 views

GeoPandas sjoin with extensive quantities

I have one geodataframe that contains polygons and corresponding land use category (e.g. agricultural, commercial, retail, residential, ...) and another that contains census tract polygons and ...
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1answer
174 views

Enlarging/shrinking while maintaining aspect ratio when using Google Earth Pro to Edit Image Overlay?

In Google Earth Pro "Edit Image Overlay", the only way I have found to enlarge or shrink the overlay while maintaining the X:Y aspect ratio is to grab one of the four green corners (not the four ...
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212 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?
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892 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 ...
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1answer
143 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 ...
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1answer
130 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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2answers
824 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
72 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
229 views

Custom Overlay Grid - Labeling the axes differently

i have a map where i want to put the grid axes. i have a separate layer based on which i want to create the axes. now custom overlay feature in arcGIS gives you only one label field to label the axes ...
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1answer
294 views

Using different resolution for two overlaying layers?

If I have 2 layers: one satellite image (15m resolution) and one relief (about 30m resolution). Can I overlay the relief with some transparency over the satellite image? It obviously "works" but ...
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1answer
98 views

Can I overlay a CartoDB visualisation on Bing Maps base?

If I am using Bing Maps as my base map, can i overlay a CartoDB visualisation (that I created earlier) on top of it? If so how do I go about doing that? The example on the cartodb site only refers to ...
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1answer
337 views

Using spatial join in ArcGIS for Desktop?

I have two spatial layers of about the same (not exactly same) spatial extent. Layer#1 has about twice the number of polygons than layer#2 (in thousands). I am trying to calculate values for Field#X ...
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1answer
40 views

Growing error from west to east when overlaying raster and shape

I am using a shape of Austria from gadm.org which I want to overlay with a netCDF file in R. As the netCDF has projected coordinates in EPSG:31287, I have reprojected the shape using FWtools and the ....
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1answer
263 views

Is it possible to join two different data sets in QGIS?

I have one data set which contains all federal states of Germany. The other dataset is about the population density in every km² in the EU. My goal is now to join these two Datasets so I can answer ...
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1answer
383 views

CartoDB - can we overlay 2 visualizations

Suppose we make two map visualizations from a loaded polygon shapefile in the CartoDB free online system. Could we overlay these 2 maps on top of each other in a web page using the CartoDB.js API? ...
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1answer
509 views

How do I view ovl files on Geogrid or Top50 then convert the data to shapefiles?

I have some .ovl files which can only opened on Geogrid or Top50 viewer which shows me where everything is. How do I take these ovl files and convert the properties to Shapefiles to be used on ArcMap ...
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2answers
238 views

OpenLayers + GeoServer problem with WFS projection

In GeoServer I have a layer in EPSG:26191. In OpenLayers I add it on map as WFS: markerLayer = new OpenLayers.Layer.Vector('Markers',{ strategies: [new OpenLayers.Strategy.Fixed()], ...
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1answer
1k views

How to overlay a jpg onto a google earth image?

I have produced a model from an online engine , and it is in a google earth picture. I want to georeference the below picture and apply the boundaries here on my google earth image. I'm using QGIS2.2. ...
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2answers
238 views

Frequency analysis and overlay analysis

Am new to gis and I hope to find help here. I am working on a research that requires that I overlay conditions of drainage systems and quality of healthcare in a coastal state to get areas which have ...
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1answer
96 views

Selecting features of layer present just in one feature of another layer?

I'm a student approaching to QGIS 2.0.1-Dufour. My goal is to know how many features of a layer are present just in one feature of another layer. I tried both with the tools "spatial query" and "...
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1answer
86 views

Calculate best area with overlaying multiple layers buffer shapes

I am using QGIS and I have a set of 20 layers with buffers. I'm interested in where they overlap most and I want to create a single layer that shows which are the places where they overlap most and ...
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1answer
367 views

Does a polygon in a layer intersect with another polygon in the same layer [closed]

I am a CS major with little experience in GIS. I am working on vector polygon overlay. Looking at GML and shapefile data, I realized that a map is made up of a large number of polygons. Does a polygon ...
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18 views

QGIS GRASS tools output has only “cat” column in attribute table - missing full attribute table

Using the GRASS Tools plugin in QGIS 3.10.2 with GRASS 7.8.2 I have imported a series of layers and used the "v.overlay.or" algorithm to "union" them. This has worked successfully many times and once ...
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13 views

Trying to display a line grid in Massachusetts [closed]

I am currently attempting to make a line grid that overlays a Massachusetts Town Boundary shapefile. When I set the extents based on the coordinate number, it keeps being displayed in the ocean around ...
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20 views

Finding map zoom level on basis of image width & height or worldFile data or on basis of field area in Android

I am trying to render the satellite images on google map in Android, and I am able to do that but the issue is, some images are not getting rendered properly because of the zoom level. Every image ...
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1answer
18 views

Move and/or Remove Markers in ArcGIS Graphics Layer

I'm using the ArcGIS 100.6 iOS SDK and am populating the map with markers on a Graphics Overlay Layer whose locations are stored in a database common to all users of my application. Each marker is ...
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13 views

Subtracting features from one layer using another layer in ArcGIS Desktop? [duplicate]

I have 2 layers of land parcels for a particular area (shown on top of each other like so): The darker parcel lines and road polygons are from an earlier parcel map. The land has been developed and ...
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24 views

How to select SpatialPoints inside the SpatialPolygons

I have two documents. One is a csv file which contains lon and lat information. Another is a shapefile. I want use "over" command in r to select points inside the polygons, but I get all NA results. ...
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23 views

Coordinate system problem; two features won't match up (linear units problem?) [duplicate]

I have two features that should overlay, both are shape files and one is polygons and one is polyline. The line should essentially outline a specific region in the polygons, but they are completely ...
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22 views

Clip OR Overlay in ArcGIS output feature empty

I use the Clip and Overlay to deal with download data. But they do not work and result in failure. Maybe the data is too large for ArcGIS Desktop to calculate. I do not know where I can check whether ...
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1answer
27 views

Rotating around arbitrary point, not center when using Google Earth Pro to Edit Image Overlay?

In Google Earth Pro "Edit Image Overlay", we can rotate the overlay around its center (via grabbing the green diamond,) but how might one rotate it around an arbitrary point not its center? (Yes, ...
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44 views

Leaflet image overlays and iOS 12: partial rendering

My PWA (using Leaflet 1.5.1) is currently running (since 2 years) on Android and iOS without problems, until iOS 12 was released. From that point on I have very weird issues on iPhone and iPad. Main ...
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1answer
150 views

Image Overlay 3D Adapt in Google Earth

When adding an image overlay (specifically a GeoTiff exported from QGIS), the image looks great until you turn on 3D buildings or terrain. These features pop through the image overlay, and disrupt the ...
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133 views

Creating a Leaflet Overlay from JSON

I am trying to make an interactive map using leaflet where the user can toggle an overlay of multi-polygons. So far the following code works using a checkbox to display dummy point data, and radio ...
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26 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
11 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 ...
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2answers
214 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 ...
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557 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
210 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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1answer
452 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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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 ...
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1answer
84 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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2answers
1k views

Creating prediction grid within certain boundary for surface interpolation in R?

I am trying to create a prediction grid within my boundary polygon. Firstly I need to make sure that my boundary shapefile is in UTM coordinates: NZGD <- CRS("+init = epsg: 2193") Load my ...
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1answer
1k views

Closer for measureToolTip, openLayers 3

I want to add for my map measure tools. I added distance for line and square for polygon. Also i added erase for drawed element, but i can't to clear measureTooltip. First I try do it with Overlay....
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78 views

How to make a polygon and point shapefile line up to do a spatial join? [duplicate]

I have a polygon with a North_America_Lambert_Conformal_Conic coordinate system and a point shapefile which had a WGS 1984(DD) coordinate system. I defined projection and projected both of them to ...
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1answer
303 views

Weighted Overlay final raster to indicate inputs

I have a weighted overlay that identifies the most important areas in a corridor scaled from 0 - 100. I would like to be able to click on a cell and be able to identify which input rasters contributed ...
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1answer
524 views

Image source of world political map for Google Maps overlay in Android?

I have searched a lot. But I am not able to find some high resolution image of world map showing countries in different colors without label, which I can slice and use to create tile overlay in my ...
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1answer
2k views

In leaflet does the addControl automatically handle events via the leaflet API?

I need to add additional overlay layers to be controlled by the controls within the leaflet map boundaries, but the code utilizes a leaflet-custom.js file. I am assuming it handles the event and ...
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1answer
86 views

CAD data not overlaying in ArcGIS, but has correct coordinates in AutoCAD

I received a set of drawings that were drawn in millimetres but in the correct coordinate system; I use GDA94 with my coordinates in metres, so this should theoretically be a simple fix using my usual ...