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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24 views

GMap.Net: Does the WPF version have overlays?

I just downloaded GMap.Net and I'm just starting to explore the API. I know it has GMap.NET.WindowsPresentation assembly, which is designed to be used for WPF projects. It also has GMap.NET....
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1answer
23 views

Automatically populate attribute table based on feature location within another feature?

I have two datasets. One of all the suburbs in a particular state. The other of all the housing lots across the state. I want to add a field to the lot feature class' Attribute table which can then ...
1
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0answers
29 views

Combining line vector shapefiles with different attributes

I'm using ArcGIS 10.3 for desktop. I have two shapefiles, both with polyline vector data for roads in the same area. This area is quite large, approximately 7,500 km², so there are a lot of roads in ...
1
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1answer
21 views

Weighted polygon-feature-classes combination/overlay analysis using ArcGIS for Desktop?

I have several (sometimes, not always overlapping) Polygon Feature Classes which are all weighted/ranked through a field from 1 to 10 (10 is best). I would like to combine/overlay these layers them, ...
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0answers
12 views

ArcGIS Overlay route events

I have bus onboard volume data stored as a polyline shp file. The polyline lengths are the distances between sequential boardings and alightings. So along any particular bus route there are ...
0
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1answer
52 views

Don't understand error : Error in if (nchar(projargs) == 0) projargs <- as.character(NA) :

When I run two different scripts from examples (which seem to work where I took them from) I get an error in both cases. Something seems to be wrong in my general set up or something. But I have no ...
1
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1answer
39 views

Overlaying two vector shapefiles on a basemap results in a misalignment

I have been trying to overlay two shapefiles of the Harare Zimbabwe streetmap one with centerlines and the other digitized as polygons. the challenge i am facing is that the two overlay but not on the ...
1
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1answer
17 views

KML for Labels in Cesium to Display Countries, States, Roads, etc

Is there a free way to display countries, states, roads, etc. in Cesium? I imagine these could be displayed using a comprehensive list of ground overlays in KML. I have looked for free sources of KML ...
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2answers
23 views

R: Overlay using functions containing if/else statements

I have two rasters, x and y, and I'd like to do calculations with them using the overlay function. For example, MyFun <- function(x, y) x * y res <- overlay(x, y, fun = MyFun) This seems to ...
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0answers
34 views

Is it possible to intersect multiple polygon shapefiles to identify areas where two or more layers overlap?

I have 19 polygon shapefile layers, with some occasionally overlapping with one another. As a final output, I would like a shapefile that includes only the overlapping areas between 2 or more of these ...
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0answers
36 views

Matching drone point cloud data with original lidar survey? [duplicate]

I have point cloud data collected from a drone of a particular area. I too have the point cloud data collected from the lidar survey. Both are georeferenced. Now, I need to match the point cloud data ...
1
vote
1answer
32 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 ...
2
votes
1answer
34 views

Summarising an attribute from point layer in polygons with FME

I have a number of polygon feature sets and a point layer containing an attribute with population count. I want to summarise the population attribute for all points within each polygon feature set ...
0
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0answers
6 views

Android app to follow track

Is there any Android app that will allow me to follow a track and view an image overlay, both contained in a kmz file saved from Google Earth?
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0answers
19 views

How to Determine Land Use Change Rate Using Overlay Tool in Arcgis [duplicate]

I am interested in assessing land use change rate within two time periods of 2000 and 2010. I have classified land use raster data for the two periods. I will like to know which area remain unchanged, ...
2
votes
1answer
80 views

Calculating total area overlapping specific raster DEM color interval whose boundaries are confined by another vector?

I know this sounds quite difficult, but maybe it isn't for you or at least it shouldn't if I explain it correctly. (I'm using QGIS 2.14) I'd like to know to calculate total area overlapping a ...
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0answers
41 views

DotSpatial Opposite of Featureset.Intersection

DotSpatial 1.8: I have some code to give me the intersection of my trip polyline and where it crosses key polygon regions. That works well: Dim fsResults As IFeatureSet = fsTripLne.Intersection(...
0
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1answer
48 views

Tile server overlay in Google Earth?

I have recently become aware of a number of tile-server map sources and I would like to use these as overlays in Google Earth. Is there a way to do this directly that does not involve pre-downloading ...
0
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1answer
69 views

Leaflet Basemap and Overlay Display

When running this why does the open street layer not show up as the base layer by default? and why does the precipitation layer come up as already checked to display? None of the other overlays ...
1
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1answer
36 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 ...
2
votes
1answer
36 views

How to display data at diffrent depths in ArcScene

I am looking for a way to display data at different depths in ArcScene. I have a bathymetry layer which displays fine, and I want to overlay oil platforms in 3D over the bathymetry to show where ...
1
vote
1answer
23 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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0answers
15 views

Overlay tools failure in ArcGIS 9.3 [duplicate]

I consistently get various error messages almost everytime I try to use an overlay tool (e.g. union, intersect, clip, spatial join) or in one case with spatial join I got none-sense results. Some ...
3
votes
1answer
57 views

Polygon made by colour difference

I need to analyze differences (historical) in coverage of some species (seagrass Posidonia). Although its a marine species, subject area is very shallow and even from common satellite and aerial ...
1
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1answer
164 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
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1answer
25 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
54 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 (...
1
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0answers
30 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
23 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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0answers
51 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 ...
2
votes
1answer
54 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
23 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/...
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0answers
27 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 ...
5
votes
2answers
145 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
80 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
101 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
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0answers
49 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? UPD Solved You can set ...
1
vote
0answers
39 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
73 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 ...
1
vote
1answer
50 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
41 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
66 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
72 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 ...
1
vote
2answers
58 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
117 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
90 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
17 views

Redefined Topo and Shape file still wont overlay

I am trying to overlay a topographic map that is a raster and a road shape file. The road shape file was originally not defined. I defined the projection to NAD_1983_2011_Contiguous_USA_Albers and I ...
2
votes
1answer
34 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
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0answers
52 views

How to make a polygon and point shape file line up to do a spatial join?

I have a polygon with a North_America_Lambert_Conformal_Conic coordinate system and a point shape file which had a WGS 1984(DD) coordinate system. I defined projection and projected both of them to ...
0
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0answers
43 views

Polygons Present in another Polygon (Selection/Attribute Transfer)

I have 2 layers, Sugar Data and Surveyed Parcels. My interest is to include 2 new fields in the sugar data (lot & plan) which is present in the surveyed parcels data. Im using Arc Map 10, can ...