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
2
votes
1answer
2k views

How to add OpenSeaMap tiles as an overlay on top of osm base map with Leaflet?

After generating the OpenSeaMap tiles, I tried to add them as an overlay upon the openstreet basemap. The idea is after generating the OpenSeaMap tiles to serve them as "static" tiles to the client, ...
4
votes
1answer
33 views

Defining city name by using KMZ files

We have KMZ files of different satellite images. We want to check which cities these satellite images belong to. Is there a way to do it automaticly? Like a tool in ArcGIS or QGIS or whatever?
2
votes
1answer
67 views

Aggregating up spatial information

At present I have a dataset which is broken down by Electoral Divisions (circa 3,500). However, due to issues with some of my variables I need to choose a larger spatial unit - Local Electoral Area (...
2
votes
0answers
225 views

google earth - viewing KML file in world map

I"m using google earth and a KML file that I have generated. I would like to display all the KML points in a world map. Google maps online does it but the print is poor. Need a 300 dpi print which ...
1
vote
1answer
116 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 ...
1
vote
0answers
216 views

Georeferenced Image Overlay and export to new image

I have two Geotiffs (one satellite image, one clipped image). I want to put the clipped image over the satellite image, because it shows flow velocity from this shown glacier (see image below). I ...
3
votes
1answer
196 views

PostGIS function ST_SymDifference between two segment groups produces unexpected results

I try to calculate the symmetric difference for a set of segment groups A and B with precision of 1E-5 (ST_SnapedToGrid(geom,1E-5). I've formulated the an ideal test case for a H based shape segment ...
1
vote
1answer
44 views

Counting points on a line or polygon using join: number of points are calculated incorrectly [closed]

I am attempting to count the number of stream crossings within approx. 100m segments of a trail. I used this article to get quite close with join: http://support.esri.com/cn/knowledgebase/...
0
votes
1answer
97 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 ...
8
votes
2answers
505 views

TileStache Vector Tiles Overlay problem

I am using TileStache to serve my own vector tiles using a postgis datasource. First I re-projected the shapefiles I had using ArcMap ( reprojected to Web Mercator (Auxilary Sphere)) and loaded them ...
0
votes
1answer
970 views

compare three rasters and three conditions with overlay in r

I'm trying to run an overlay function with rasters where I want to meet all of 3 different conditions at each cell and produce a single raster as output. Running ifelse with the & operator ...
-3
votes
1answer
1k views

Same coordinate system - shapefiles don't overlap [duplicate]

I have two shapefiles and two rasters (dem), and while I put them in the same coordinate system (Greek grid), it seems that they don't overlap. But one is the boundaries of a county, and another the ...
1
vote
0answers
401 views

Can MapboxGL use nearest neighbour interpolation for overlay image? [closed]

In HTML+CSS version of mapbox/leaflet I can set image-rendering option for .leaflet-image-layer with CSS to choose interpolation method. How can I make this in GL renderer? Update: Solved You can ...
1
vote
0answers
134 views

Polygon overlay, calculating changes, in QGIS?

I'm trying to create a relationship file between two vintages of census tracts. (in this case, 2010 and 2013.) Reason being to load ACS (American Community Survey) census data and use weighted means ...
0
votes
1answer
715 views

How to overlap a base map with a png map (format .pgn) on QGIS-Pisa?

How can I overlap a relief base map taken from maps-for-free.com and this png-formated map so that I can get a resulting map with relief of the 1st map and boundaries of the 2nd map ?? I'm a ...
2
votes
1answer
283 views

Determine the range of values in one raster associated with certain values in another raster

I have two rasters, one with thematic data, and the other with continuous data (floats). I am trying to calculate/determine the the range of float values associated with the different classes in my ...
1
vote
1answer
168 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 : ...
1
vote
0answers
410 views

Leaflet.js setBounds, scaling

I'm using leaflet.js to create a map of Scotland, with two insets for the Orkney and Shetland groups of islands. This is as far as I've got. I wish to guarantte that no matter what size the overall ...
2
votes
2answers
114 views

Selection on Overlapping Polygons

I have converted a CAD file to GIS format using GIS (from .dgn to .shp)... In one layer I have polygons in which a smaller one is on top of the larger polygon. I can see both polygons however when I ...
2
votes
2answers
107 views

How to overlay subset of one data set onto another

I have two data sets: one for Thurston County, Washington and one for all of Washington state. I created a map of hydrology features in Thurston County, and now I want to take the data from the ...
0
votes
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....
3
votes
2answers
459 views

Get tile layer intensity at given zoom and longitude/latitude (Leaflet)

I can display a tile layer as an overlay in Leaflet via an url of the form path/to/my/tile/layer/{z}/{x}/{y}.png : my_overlay = L.tileLayer('http://path/to/my/tile/layer/{z}/{x}/{y}.png', { maxZoom: ...
1
vote
1answer
49 views

Redefined topo and shapefile still won't overlay

I am trying to overlay a topographic map that is a raster and a road shapefile. The road shapefile was originally not defined. I defined the projection to NAD_1983_2011_Contiguous_USA_Albers and I did ...
2
votes
1answer
79 views

How to show overlay in layout legend [closed]

I am displaying three different layers on a map, essentially three separate habitat types. Each have their own colour. In cases, 2 or 3 of the layers overlap in part (essentially showing where ...
0
votes
0answers
77 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 ...
6
votes
1answer
687 views

Extracting the pixelwise proportion of classes of a finer raster in a coarser one

I have two rasters, one has a 1 km resolution. The other has a spatial resolution of 30 m. This latter pixelwise is a classification. I want to overlay the 1 km raster on the classification raster and ...
3
votes
1answer
2k views

Loop to check multiple polygons overlap in r

I have a set of polygons (available here: http://ulozto.cz/x39ELbFt/polygons-zip) created in QGis and processed in R. I would like to know if they are overlapping or not, and if yes, where is the ...
1
vote
1answer
1k views

Overlaying grids with a polygon to determine the average value of the overlapping grids for that polygon

I would like to add the average, minimum and maximum value of, let’s say soil moisture (variable "value" in my case), to each NUTS3 region (= a NUTS3 region is a polygon of a certain small area in ...
4
votes
1answer
570 views

Grid vs. Polygon Overlay in R gives different results than in QGIS

I have a shapefile of range polygons. Each colored set of polygons represents a different group of species/genera/whatever. I next overlay a 5x5 grid onto this map. And then use join attributes by ...
8
votes
1answer
3k views

Generating grid shapefile in R?

I have the following shapefile of a 10x10 degree latitude/longitude grid that I created in QGIS. I can read it into R using the rgdal package. Grid<-readOGR(".","GridShapeFile") It has the ...
1
vote
0answers
100 views

Overlapping polygons with buffers and need to keep associated data [closed]

I have a point file that has been buffered by 400m. I have overlayed it on top of a polygon file and I need to keep all data that overlaps for each point. What is the best way to do this? I have ...
3
votes
1answer
838 views

Overlay Analysis in QGIS (or Preferably Python)

I would like to perform an overlay analysis in Python or QGIS to output a list of each shapefile that falls within certain boundaries. I have unsuccessfully tried to use the Spatial Join, Intersect, ...
2
votes
1answer
1k views

kml/kmz files not loading by google maps anymore

Until a few months ago this worked: https://maps.google.com/maps?q=http://www.jcea.es/pics/italia2015/italia2015.kmz It is NOT working anymore. I know that I can login in Google maps, create a ...
1
vote
0answers
158 views

Using ArcGIS Desktop to calculate Conversion Probability certain land use to other land use? [closed]

I am doing dissertation about [predicting future urban expansion for Shannon River Basin In Ireland using Cellular Automata model and arcGIS] so at this stage I would like to calculation the ...
2
votes
2answers
7k views

Creating a new raster layer based on mean of other raster layers, ignoring NA values in R

I am trying to create a new raster layer that is made up of the mean values from 7 other raster layers. I get results using overlay function mean: mean <- overlay(2000, 2001, 2002, 2003, 2004, ...
1
vote
0answers
743 views

Using R to find attributes of spatial neighbors, especially with big spatial polygon data frames [closed]

I have a specific question that leads to a more general one. First, the specific: I have an analysis involving census blocks and point level exposures (see here), where I'm doing work with ~200,000 ...
3
votes
0answers
126 views

Shaded KML overlays on OSM tiles in QGIS?

This seems simple - but the solution is escaping me. I have a series of dynamically generated KML files describing simple, shaded polygons, with each polygon having a slightly different (externally ...
3
votes
1answer
83 views

How do I edit multiple features at one time?

In my case, there are about 30 overlaid features. How do I select all and edit them at one time? I want to reshape the features, mainly using the node tool to reshape a straight line into a (fake) ...
1
vote
1answer
596 views

Compare two rasters in R with the cell value from one replacing the cell value from another

I am trying to create a single raster from two rasters. The first raster is made up of all 0 values and the second is made up of the current date value (formatted in days from 001 to 365). The problem ...
1
vote
1answer
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 ...
1
vote
1answer
226 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, ...
1
vote
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 ...
1
vote
1answer
307 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 ...
0
votes
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 ...
0
votes
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 ....
0
votes
1answer
246 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 ...
0
votes
2answers
51 views

Generate a single shapefile from various intersection agreements

I have five vector files wherein I want to determine the spatial agreements among them using intersect. Here is my illustration. (Actually these are forest shapefiles from five different forest maps.) ...
0
votes
1answer
289 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 ...
1
vote
1answer
302 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 ...
1
vote
1answer
214 views

Calculating area of residential area wihin multiple ring buffer in ArcMap?

I need to calculate the size of residential area within 0-250m, 250-500m and 500-750m of a bus stop. I have made a multiple ring buffer around the bus stops. And I have a shapefile of the residential ...