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
1
vote
1answer
142 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
vote
2answers
68 views

Adding information to polygons inside polygon from other polygon in QGIS?

I have two layers in QGIS. The first one contains buildings and the second one contains blocks. Now I want to add the ID of the block to all buildings inside this block. Are there any functions in ...
1
vote
1answer
65 views

Getting Canada shapefile to overlay model on QGIS?

How can I get Canada to overlap with the rest of my map? I think this is a CRS problem but I really do not know how to solve it.
1
vote
2answers
129 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 ...
1
vote
1answer
789 views

Calculating coverage of vector polygon over other polygons?

I have a shapefile file that contains a LiDAR footprint and I'm trying to figure out how much a county is covered by the LiDAR footprint. Two separate shapefiles. The attribute table for the county ...
1
vote
2answers
2k views

Identity tool not working as expected?

I have two shapefiles. Shapefile A has five attributes and shapefile B has 20 attributes. I use the Identity tool to determine, what of shapefile A lies in shapefile B. This is how both attribute ...
1
vote
2answers
745 views

What is the most efficient method to delete points?

I have a script that takes a point featureclass (FC) through the following workflow: Select points that lie within individual polygons From the selected points within each polygon, randomly subset X% ...
1
vote
1answer
978 views

Can't display overlay

I am trying to add a WMS radar overlay to my map but it won't seem to gather it. noaaRdr = new OpenLayers.Layer.WMS("Latest Radar", "http://nowcoast.noaa.gov/wms/com.esri.wms.Esrimap/obs?", { ...
1
vote
1answer
495 views

I am looking for a library or API to do vector overlay for two map layer (shapefiles or GML files)

I need to perform vector overlay operation on any two map layers as ArcGIS and Grass GIS performs. I am wondering is there any API or library ( in C, C++ or Java) so that I can use that third party ...
1
vote
2answers
18 views

Multiply cell values during r.mapcalc in GRASS

I'm doing some sieve mapping in GRASS. I have several map layers containing various values representing site suitability ranks. I need to use r.mapcalc to add these maps together for example map1 + ...
1
vote
1answer
227 views

Using Statistics by category in QGIS?

I use the "statistics by category" tool from QGIS to learn what grain yields I got from different combinations of scenarios like: Soil A + Hybrid A + Planting Date A = Yield n Soil B + Hybrid A + ...
1
vote
1answer
2k 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 ...
1
vote
1answer
162 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 ...
1
vote
1answer
219 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 ...
1
vote
1answer
667 views

Weighted Overlay with “nodata” cells

I´m currently conducting a suitability analysis with the weighted overlay function. One relevant criteria is the proximity to highways. If the wind turbine is located up to 300 m away from the highway,...
1
vote
2answers
137 views

Historical maps as cylindrical projections

Objective: I want to overlay old, historical maps on top of Google Maps. According to Wikipedia, Google Maps uses a variant of the Mercator projection, a close relative of cylindrical projections. ...
1
vote
1answer
881 views

Merge two maps with OR operation in GRASS

I have two vector maps. The two maps cover the same area but are split up into polygons differently (i.e. if you were to imagine one map placed above the other, the lines defining the polygons would ...
1
vote
2answers
107 views

Performing identity operation in PostGIS?

I would like to perform spatial identity operation (ArcGIS example here) using PostGIS. I have two polygon tables, one of which is the input layer and the other table is the overlay layer. The output ...
1
vote
3answers
196 views

Spaghetti, meatballs, and the one-to-many problem

I am trying to use the Spaghetti and Meatballs overlay technique to create a fire history layer from Cal Fire FRAP's fire perimeter data. I am following the technique Dale Honeycutt describes in his ...
1
vote
1answer
584 views

Calculating area of overlap between two polygons in separate layers using QGIS?

I have 2 layers with 1-1 polygon. The polygons are overlapping. How do I calculate the area of the overlap using QGIS?
1
vote
2answers
43 views

Polygons from different layers

How to create a map with polygons from all the different layers? I'm using ArcGIS Pro and it does not have Overlay analysis tool.
1
vote
1answer
429 views

ArcGIS Combine Fuzzy Membership and Weighted Sum

I would like to combine the workflow of fuzzy membership and weighted overlay for a suitability analysis and would like to ask if this is "allowed" scientifically. I have severeal criteria, some ...
1
vote
1answer
236 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, ...
1
vote
2answers
761 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 ...
1
vote
1answer
893 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
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 ...
1
vote
2answers
614 views

Performing unweighted overlay on multiple raster layers

Is there a simple process in ArcMap v10.2 that will allow me to overlay three raster images, whereby any obscured pixels will be deleted in the output file? I do not want to retain the values of any ...
1
vote
1answer
2k views

Intersect Multiple Layers

I have thirteen polygon layers showing species at risk ranges - I have a standard arc GIS desktop license, allowing only two inputs to the intersect/union tool at one time. I need to create a "hot ...
1
vote
1answer
334 views

Erasing overlay geometry with in the feature class..!

What is the best practice for erasing overlay geometry? My scenario is: I have a polygon layer with 1000 features. i need to create a tool from model builder that select polygons with user defined ...
1
vote
2answers
6k views

Replace google map MARKER with HTML element

I want to add a custom HTML element (that can become transparent dynamically) instead of a marker. Basically my html object would be a cirle (or rounded pin) with a picture of users in the middle. ...
1
vote
1answer
136 views

Why are attributes missing in overlay tab QGIS 1.8.0?

I want to add a diagram overlay onto a shapefile layer. When I look at the attribute table, all the correct columns are shown. However, when I open the layer property box, the attribute columns I want ...
1
vote
1answer
953 views

Summarizing polygon area using another polygon in ArcGIS for Desktop?

I have a shapefile representing public/private lands in Montana. This is a multipart shapefile where I've simplified attributes so that #1==private and #0==public. Next I have a shapefile of ...
1
vote
2answers
2k views

OpenLayers WMS disappears when including OpenStreetMap

Setup: ArcSDE 9.3.2 Oracle 11g GeoServer 2.1.4 OpenLayers (latest build) OpenStreetMap InternetExplorer 7.0/ Google Chrome EDIT: I have updated information just below the screen shots Problem: ...
1
vote
2answers
33 views

GRASS r.mapcalc to replace null values

Is there a way to use r.mapcalc to replace null with 0? I tried if(isnull(map1), 0) but that produces a map that is entirely 0. I need only cells containing null to be altered!
1
vote
1answer
17 views

Transfer metadata related to Image overlay in Google Earth pro from one system to another?

I have been working on Google Earth pro desktop software and have overlayed many JPG images over it. Every time I close and open the software again, the images remain intact in there correct ...
1
vote
1answer
97 views

Leaflet side by side plugin is not working with imageOverlay

I'm trying to use the side by side plugin. I already check in the issues and change the getContainter() with getPane() in the .js file. this._divider.style.left = dividerX + 'px' this.fire('...
1
vote
1answer
21 views

How can I get common points of different point shapefiles in ArcGIS? [closed]

I have different data sets (point shapefile) and how can I get common point points of these shapefile in ArcGIS?
1
vote
1answer
130 views

Ordered weighted averaging error QGIS

I am trying to use Ordered weighted averaging to sum up values across different raster overlays in QGIS 3.4.4, but I get this error: Traceback (most recent call last): File "C:/PROGRA~1/QGIS3~1.4/...
1
vote
1answer
195 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 ...
1
vote
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 ...
1
vote
1answer
169 views

Using WFS Vector layers in OpenLayers?

I have some code in loop: var vector = new ol.layer.Vector({ title: name, style: styleFunction }); ...
1
vote
1answer
468 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
1
vote
1answer
1k 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 ...
1
vote
2answers
986 views

Leaflet dynamic legend for active layer controls?

I´m trying to achieve a map legend that shows the names of the active Layers and also adds new names to the list every time a new layer is checked. Also it should only appear when at least one layer ...
1
vote
2answers
451 views

Creating raster from several polygon layers using ArcGIS Desktop?

I have the following map: The four layers have the following attribute tables: SF_UrbanTreeCanopy_84 SF_Building_Footprints_84 GrassBeach Water I want to create a ...
1
vote
1answer
228 views

Counting overlaps on large line dataset using FME runs into memory issues?

I have a large dataset of lines (ca 400 000). Each line represents a calculated route on the same road network. My goal is to summarise a total number of calculated trips that pass each part of the ...
1
vote
1answer
25 views

Assigning value to point feature class based on count of cells with certain raster values?

I have a point feature class that I would like to assign a new field based on the neighborhood of a raster layer. I'd like to count the number of cells within that neighborhood and write that count ...
1
vote
1answer
921 views

Blending overlapping raster mapsheets with QGIS and GIMP

How can overlapping raster map sheets be overlaid in QGIS, and manually blended together in GIMP? I have an overlapping set of hand-drawn raster maps that contain varying levels of detail and would ...
1
vote
1answer
194 views

Mapinfo SQL - create table that shows where a new polygon does not intersect with another

I am attempting to carry out SQL to - create a table that shows where a new polygon (Proposed BMO Overlays) does not intersect with another (Existing BMO Overlays). I have attached an image on my Map ...
1
vote
1answer
225 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 ...