(1) abstract geometry; (2) storing geographic data in projected coordinates; (3) a generic ESRI term for vector features; a class for "geometry" objects.

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4
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0answers
36 views

How to update null geometries from an attribute [duplicate]

I have a large point feature class and have realised that there are several hundred features with null geometry. Fortunately the coordinates are stored as an attribute. So What I need to do is update ...
1
vote
0answers
21 views

Request long/lat precision and request too slow [on hold]

I've a PostGIS DB of 18Gb. The tab node (id, tags, geom) is very huge and I need to request long/lat on this table but it's very long when I'm using this sql request : SELECT * FROM nodes WHERE geom ...
1
vote
2answers
22 views

Over-calculation of area due to parcels occupying same space

I'm trying to get the total acreage of different parcels by land use, and unfortunately I keep getting a total of ~15000 acres instead of ~12000 because it's over-calculating the area where there are ...
1
vote
1answer
12 views

Getting Error: Districtna.getExtent(…) is null

I have dojo combo box to display district names when I select one district it should zoom to that particular district.selection is working fine but zooming not happening i am getting ...
2
votes
1answer
29 views

Why can't save changes on GeoServer layers via QGIS?

I am using QGIS 2.14 on Windows 10, and GeoServer 2.8.3 on Windows 2008 Server (VPS). QGIS manages my GeoServer layers with Web Feature Service. I would like to change the geometry or attributes of ...
0
votes
0answers
5 views

MapGuide Fusion OpenLayers 2.13 ModifyFeature - how to get input object from Fusion…?

I'm looking for a way to pass the Fusion object's selected geometry into OpenLayers.Control.ModifyFeature to initiate an edit session for the user. Non-Fusion Example: ...
2
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4answers
286 views
3
votes
2answers
142 views

Transform geometry to coordinates

I need transform with postgis a geometry of type ...
5
votes
2answers
137 views

Are there any multipolygons in my shapefile?

In QGIS 2.x, is there a simple way to determine if a polygons layer contains multipolygon geometries and if yes: which are these features?
3
votes
1answer
24 views

Change feature class from ESRI native geometry to SQL Server geography

Original question: I have found a lot of documentation on importing and using query layers from SQL Server into ArcCatalog/ArcMap/etc. However, when you change the projection of a feature class or use ...
0
votes
0answers
23 views

How to use the “geometry generator” to intersect geometries with an entire layer in QGIS?

In the "geometry generator" style in QGIS, it's possible to define an intersection for a specific geometry of an other layer like this: intersection($geometry, geometry(get_feature( ...
0
votes
0answers
21 views

Can you merge GeoJSONs in PostGIS?

I'm not too familiar with the GeoJSON functionality in PostGIS. In essence - I'm having problems with the computation of ST_AsGeoJSON(ST_Union(g)) taking too long for large g. Is it possible to ...
3
votes
2answers
1k views

How to densify a polyline according to a specific length? [duplicate]

Possible Duplicate: Add vertices to lines I am using QGIS 1.8.0 I would like to densify a polyline according to a particular length of segment (ex. 200 m). I know it is possible with other ...
1
vote
1answer
1k views

Get geometry from OpenLayers.Control.WMSGetFeatureInfo JSON

I need to store the geometry of a certain feature with OpenLayers.Control.WMSGetFeatureInfo and i'm using these parameters to get it in json format output:'features', infoFormat:'application/json', ...
2
votes
0answers
60 views

Geometry issues when digitising in QGIS

I'm digitising a large number of maps from hand drawn mud maps and digital images, and although I have used the snapping tools ("snap to vertex and segment", Tolerance 10 pixels, avoid intersections) ...
0
votes
0answers
13 views

Converting polygons to contours based on value in polygon table

I have the following and data and have been asked for a map that shows the same data set but displayed as contours. Each polygon has a value in it's table called "count". The "count" field is used to ...
9
votes
4answers
310 views

How to snap a road network to a hexagonal grid in QGIS?

I'm trying to use QGIS 2.14 to snap a road network to a hexagonal grid, but I'm getting strange artifacts. I've created a hex grid with MMQGIS, cells are approx 20 x 23 m. I've buffered the road ...
1
vote
1answer
287 views

Using M 'Measure' value in SQL Server 2008

MS Sql Server 2008 geometry type supports adding Z and M values to geometry objects, including linestrings. However, I cannot find any way to make use of these values, since methods such as ...
1
vote
1answer
28 views

How to use “geometryEngine” in arcGIS Version 3.9

We are using arcGIS javascript version 3.9 in our portal. Now we have new requirement to do reverse clipping on map. We have already written code to implement reverse clipping with the help of ...
1
vote
1answer
494 views

Is it possible to draw polygons along Google Maps Polyline?

Web application has option that user draws polyline on Google Map. After he draws it, there is a button 'Add polygons', which should draw polygons along that line, based on some width and height in ...
0
votes
0answers
19 views

Handling empty PostGIS geometries with GeoServers Pregeneralized Features extension

I've setup my GeoServer instance (2.8.2) with the Pregeneralized Features extension to serve several large polygon layers from PostGIS (9.3), and while it is working I am still experiencing remarkably ...
1
vote
0answers
33 views

How to calculate a Label Point for a (multi)polygon [duplicate]

ESRI software has a concept of a 'label point' for a (multi)polygon. It is like the centroid, except it is guaranteed to be within the (multi)polygon. Like for a U-shaped polygon, the label point is ...
1
vote
3answers
68 views

Searching for changes of 2 layers based on geometry, Arcgis for desktop (ArcEditor

I´m trying to make a tool that would be able to compare 2 layers of any type (polygon, point, polyline) and find differences between them. Lets say i have a layer of roads (Polyline) from 2005 (layer ...
2
votes
0answers
17 views

Path Matching for Journeys Using XY Coordinates [closed]

I am trying to find some suggestions on ways or algorithms to determine path similarity. An illustration of 3 paths using made up data is given below. The title should be finding similar paths instead ...
3
votes
0answers
43 views

Interpolating point to nearest polygons to compute street width in posgis

I am trying to calculate the width of streets (line.shp) in postgis using reference point (ref_point.shp) (yellow point features) and building polygons (building.shp). The red point features are the ...
0
votes
1answer
955 views

SQL Geometry Query similar to Select by Centroid

Does anyone know if it's possible to query SQL geometry by something like 'centroid of polygon'...similar to ArcMap's select by location? I'm using SQL Server 2008 R2 as the DBMS. I have two polygon ...
1
vote
1answer
28 views

How to check point intersection with bbox made from two points?

I have two points which represents lower left and upper right point of BBOX. I have one point which SHOULD be somewhere inside and I want to test it. I have all of them as 'geometry(POINT, 4326)' ...
7
votes
3answers
1k views

Is there a way to “invert” Polygons?

I have a Shapefile with Polygon features representing the world's land areas (continents, islands). Is it possible to invert these, and get a geometry that represents the world's oceans and seas? So ...
1
vote
1answer
437 views

SQL Data: How to draw circles with a radius based on lat/long data in DB

I have a . sqlite file with many columns, two of those columns being lat and long. I've been searching around for a bit now (don't think I want to be using BuildCircleMbr from spatialite?) but I'm ...
4
votes
2answers
197 views

Is it valid GML if the boundary of a polygon intersects itself?

Is it valid GML if the boundary of a polygon intersects itself? E.g. I have this polygon consisting of some gml:LineStingSegment and one gml:Arc: My task is to import GML based data (german ALKIS ...
0
votes
1answer
2k views

Moving graphics in Esri Flex Feature Layer

I have an ESRI Flex 2.3 FeatureLayer with some graphics in it. I am able to access the graphics geometry and parse the geometry as Esris MapPoint class for Flex Api. I am calling the update(x,y,srs) ...
88
votes
13answers
27k views

What are Definition, Algorithms and Practical Solutions for Concave Hull?

Convex Hull A convex hull of a shape is defined as: In mathematics, the convex hull or convex envelope for a set of points X in a real vector space V is the minimal convex set containing X ...
2
votes
0answers
25 views

How to resolve a rectangle with know points? [closed]

How do I find the coordinates(lat, lon) for D and E in the following rectangle? I know: A (lat, lon) B (lat, lon) C (lat, lon) AE, BE, AC
0
votes
0answers
27 views

Multi-select / modify event Openlayers 3

I'm trying to incorporate a modify feature where the user will move a point and any underlying geometry is also modified. Currently to draw a route on a map I'm taking points from a database and ...
1
vote
2answers
810 views

How to convert features of layer from POLYGON to MULTIPOLYGON?

How can I convert features of a layer from POLYGON to MULTIPOLYGON? I know how to do that using the postgis function ST_Multi but how could I do to same thing for a layer in QGIS?
2
votes
1answer
55 views

How can I intentionally corrupt the geometry of a shapefile?

I am in need of a few shapefiles with bad geometry for testing some Python code. How can I intentionally create bad geometry in a shapefile? Preferably I would be able to create three (point, line, ...
0
votes
0answers
17 views

Asp.net or MsSql Create bbox of a point proportional to image height and width

Short question is how do I create bbox dimensions that is proportional to image height and width? I'm working on a asp.net webservice to generate a map using geoserver. The parameters I have are ...
43
votes
6answers
23k views

How to find the minimum-area-rectangle for given points?

The following is another problem that I am working on it these days. As you see in the figure, (BTW, I tried to make it self-presenter) the question is: How to find the minimum-area-rectangle (MAR) ...
4
votes
1answer
60 views

How to split a circle in equal parts in QGIS?

I'm looking to split a circle polygon generated by a buffer around a point in equal parts. The goal is to be able to calculate statistics about the raster that will be under the circle for each part ...
0
votes
0answers
32 views

Comparison of polygon geometry of 2 layers (ArcEditor)

I´m facing the following Issue: I´m trying to find changes between 2 continuous polygon layers. Polygons that need to be compared dont have matching IDs - to explain, I have polygon X and polygon Y ...
4
votes
1answer
130 views

Smallworld > FME > PostGIS > QGIS, handling geometry types

I'm migrating data from Smallworld via FME/SpatialBiz Plugin to a PostgreSQL/PostGIS Environment and then trying to open the resulting tables with QGIS 2.12.1. Problem arises, because Smallworld ...
2
votes
0answers
45 views

How to convert the BLOB value for the features geometry of type st_geometry kept in ArcGIS databse on Oracle [closed]

I am using ArcGIS Oracle database and I am trying to access feature geometry points as string. But the problem is that the points are kept as blobs and I cant convert to meaningful string. select ...
1
vote
1answer
192 views

Parsing large GeoJson geometry to WKT

I'm reading a very large json file as an InputStream in Android with JsonReader. This json has a geometry object like so.. "geometry":{ "type":"MultiPolygon", "coordinates":[ ...
1
vote
1answer
2k views

Input of in-memory geometry object to Dissolve tool in ArcPy script throws Error 000732?

In an arcpy script, I run a Union on a list of geometry objects. The output is set to an empty geometry object. The Union runs fine. What I am trying to do is then feed that output into the ...
4
votes
0answers
262 views

PostGIS 2.0 st_geomfromgml using LineString fails with invalid GML representation

I am attempting to insert a geometry into a table using the st_geomfromgml function. The GML is being sourced from a Geoserver WFS request. The function call looks like this ...
1
vote
0answers
22 views

Computing intersection of distance circles around fixed points [duplicate]

(to simplify calculations, I assume a spherical earth. All distances are assumed measured "as the crow flies") Suppose we have the lon/lat coordinates for two points (p_1,p_2) less than Nkm apart. ...
1
vote
1answer
41 views

Applying Snap_edit to polygon Geometry Object

I have a project where I am modifying over 1 million polygons (representing tracts of land) to make them line up with the PLSS land grid. My process works (mostly) by cutting up polygons based on a ...
2
votes
0answers
86 views

Importing shapefile problem, unknown geometry type in QGIS

I have used ArcGIS extensively, but am at a new job with only access to QGIS. I am trying to import a few shapefiles and am having some problems. First, I opened the shapefiles in esris free browser, ...
2
votes
1answer
37 views

Calculating Geometry in ArcGIS without a Projected Coordinate System

For my project, I want to calculate the geometry of individual polygons in my layer to find area and perimeter, however it is greyed out when I try to use this tool. Beforehand, I set the data frame ...
6
votes
4answers
349 views

Filtering features using geometric attributes of polygons in ArcGIS Desktop?

Given a polygon featureclass containing many polygons of different sizes and shapes, which geometric attributes (area, perimeter, etc) could be used to filter the polygons? It's probably best to ask ...