(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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1
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0answers
27 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
18 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
33 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 ...
2
votes
4answers
289 views

Transform GeoJSON geometry to WKB

I need transform geometry from JSON like: ...
4
votes
0answers
38 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 ...
3
votes
2answers
143 views

Transform geometry to coordinates

I need transform with postgis a geometry of type ...
0
votes
0answers
6 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: ...
3
votes
1answer
25 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 ...
5
votes
2answers
139 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?
0
votes
0answers
27 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 ...
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 ...
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
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 ...
0
votes
0answers
21 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
3answers
69 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 ...
1
vote
1answer
31 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)' ...
9
votes
4answers
317 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 ...
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 ...
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
28 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 ...
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 ...
0
votes
0answers
18 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 ...
2
votes
1answer
56 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, ...
4
votes
1answer
61 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 ...
2
votes
0answers
50 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
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. ...
2
votes
1answer
39 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 ...
2
votes
1answer
27 views

Split No Longer Working When Creating Enclosed Polygons

I have been using ArcGIS Pro to create a large polygon feature class. Some of the polygons have enclosed areas I need to remove. I have been using the Split tool under Modify Features and it has ...
4
votes
1answer
132 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 ...
0
votes
1answer
42 views

Arcpy: Geometry object - distanceTo method in a for loop

I'm new to Python so sorry for this maybe trivial question. I have 4 lines and 4 points, which belong together. I want to get the closest distance from point 4 to line 4, point 3 to line 3, ... . I ...
3
votes
1answer
65 views

Calculate area of geometry derived from current feature in QGIS 2.8

I'm trying to create a new field defined as the area of the convex hull of the current feature, in the Field Calculator in QGIS 2.8. Calculating the area of the current feature is easy ($area), and ...
1
vote
1answer
42 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 ...
0
votes
0answers
34 views

ArcGIS Runtime SDK for .NET API method to convert shapefile to ArcGIS feature set?

Could anyone please let me know is there any ArcGIS Runtime SDK for .NET API method to convert a shapefile to ArcGIS feature set object?
1
vote
2answers
42 views

Extract border polygon from a geometry

I am wondering if there is a way, algorithm, tools, to create, from a geometry, another one that is the border with a certain thickness. The idea is to get something similar to that : This looks ...
4
votes
1answer
34 views

tweepy psycopg2 creating points, coordinate system SRID confusing

I am using tweepy and psycopg2 to extract tweets and input them in a postgres table. When I try to insert the point of the tweet I succeed in creating a point in the geom column I create. I however do ...
1
vote
0answers
25 views

unexpected change of area

Selecting a vector layer and running the following script, I expect the total area of my feature-geometries to be the same at the end of execution. from shapely.wkb import loads from shapely.ops ...
0
votes
1answer
56 views

Read SQL Server Geometry datatype in R

I have two datasets that come from ArcGis, stored in SQL Server. I have a column called - Shape which is a geometry data type and the value looks like this: ...
1
vote
1answer
25 views

How to convert image type into wkt

I’m working with a GIS that uses SQL Server as its DBMS. So I have to insert some data into a column called dbo.CidadesGeo, but before do that I have to understand how the geometry (geometria) column ...
3
votes
1answer
47 views

PostGIS, no use of gist for geometry column in a query

My query is: SELECT count(datasetid) FROM scenes WHERE acquisitiondate between '2014-06-01' and '2015-06-01' AND ST_Intersects(ST_GeographyFromText('SRID=4326; POLYGON((' || '10.66437' || ...
1
vote
0answers
44 views

Are GIS tools suitable for physical capacity and placement management?

I'm a complete newbie to GIS systems, I've been watching some introductory videos about GIS but I'm not yet sure if GIS tools are the right tool for solving my problem. I have a database with ...
11
votes
1answer
128 views

How big does a circular geofence need to be for the curvature of the earth to matter? [duplicate]

I'm working on adding geofences to a mobile application. I know the proper way of calculating distance between two points on a sphere is using the great-circle or Haversine formula. I don't know if ...
1
vote
0answers
41 views

Best SRID for worldwide data in Microsoft Sql Server geometry field?

I'm using Microsoft Sql Server 2012 to store geographical data related to hydrometeorological stations which are scattered around the globe (point layers and multipolygon layers). My data is in WGS84 ...
5
votes
1answer
76 views

Writing points to a file

Trying to write the city name and point coords to a file. The following works with a polygon shapefile but not the point shapefile. I know I'm missing something basic. import arcpy # Set up the ...
0
votes
1answer
65 views

Arcpy: creating a line on an existing line based on points' coordinates

I have a point which is some meters away from an existing line: This point should be snapped to the line (to the closest part) and then, based on the points' new coordinates, a new line Feature ...
1
vote
0answers
25 views

Singlepart to multipart not producing results [closed]

I have a line - a street downloaded from OSM. It is in separate parts geometrically, but is contained in one record in the attribute table. That means it is only one row. I would like to split this ...