(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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2answers
120 views

How to get ST_MakeLine ready for QGIS?

CREATE VIEW new_line AS SELECT point1.gid, ST_MakeLine(point1.geom, point2.geom) FROM point1, point2 WHERE point1.gid = point2.gid; It's possible to load the layer but QGIS says 'There is no entry ...
1
vote
1answer
254 views

ST-Links convert Feature Class to DB Table error

I'm using ArcMap with the ST-Links SpatialKit Conversion tool to convert a Feature Class to a DB Table. But I'm getting an error: ERROR: 42601: type modifier is not allowed for type "geometry". I can'...
0
votes
1answer
74 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 ...
0
votes
1answer
179 views

MS SQL table with geometry field to feature class

I have a table in a native SQL database (no geodatabase, dc_geobank_public.sde in the code) with cca. 300 000 records and 18 fields. Two of the field contains projected X and Y coordinates, and one ...
0
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1answer
272 views

Calculate distance between two points in projection EPSG:900913

I have two points in 900913 projection and I want to calculate the distance between the points. I don't want to transform points to 4326 and then calculate. How do I do this?
1
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0answers
27 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 ...
22
votes
5answers
49k views

How to get coordinates from geometry in PostGIS?

This line: SELECT geom FROM myLayer.geom will return a hex value, i'm wondering how would it be possible to get decimal values, a result that look likes human-readable coordination? Regards,
1
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2answers
101 views

How to get point location?

I load a VectorLayer which contain coordinate location point. Now, I have a VectorLayer and I would like to get the point location on a item of this layer in order to center a map to this point. Is ...
3
votes
1answer
615 views

Is it possible to figure out which “Path”(PointCollection) is clicked on within a PolyLine?

I am using ArcGIS WPF's Polyline to plot several lines (PointCollections). Adding a Path(PointCollection) looks something like this. PointCollection collection = new PointCollection(); PolyLine ...
2
votes
2answers
93 views

Copy geometry from one layer onto attributes of another?

I have two polygon layers, A and B, that have the same features but totally different attributes. I want to use the attributes from layer A, but I want them to have the more accurate geometry from ...
0
votes
0answers
53 views

Increasing Clickable Area of OpenLayers Polylines

I'm currently working on a web application where there are OpenLayers geometries that are clickable. However, since the size of the geometries can be rather small, it can be hard to click on them. ...
3
votes
0answers
109 views

How do I handle heading in UTM coordinates?

In a nutshell: Given a standard (angular) GPS measurement and heading, relative geographic north. If i take my GPS coordinates and turn them into UTM coordinates, do I also have to convert my heading? ...
0
votes
0answers
152 views

Show polygon geometry from SQL Server on Google Maps

I have downloaded Canadian Postal FSA's boundaries (Like Zip boundaries in the USA) from stats Canada and I have imported the shape files in SQL Server. I want to be able to Query the Database and ...
1
vote
2answers
272 views

Intersection point of polygon and the line created by two points ArcPy

I have polygon layer. I selected the most distant vertex from centroid (picture: point A). (How to do that is in the answer here: Select the most distant vertex from polygon's centroid using ArcPy)...
3
votes
3answers
715 views

Why is geography faster than geometry for distance calculations?

Intuitively, I thought geometry would be faster than geography distance calculations, but this says otherwise: http://stackoverflow.com/questions/3547699/need-performance-on-postgis-with-geodjango#...
14
votes
3answers
30k views

Create a geography/geometry column from x and y fields - SQL Server 2008

I'm new in SQL Server 2008 and I hope you will understand my question/need. Thus, I have a table which contains 3 fields (Name, Lat and Long) in my data base (spatial). I want to create a geometry/...
1
vote
1answer
38 views

Calculate point location with direction and range

I have a latitude and longitude coordinate pair and I want to find another point location (returning lat and long) but only have the angle/direction and distance from the first point. How can I find ...
1
vote
1answer
143 views

Visualize WKT polygon on a map

Is there any tool that will let me visualize a WKT polygon on a world map such as google maps?
3
votes
3answers
787 views

Update geometry(polygon) of shape file based on a point layer

I have two shapefiles. Polygon shapefile Point file contains some points. Now i want to delete all the vertex of polygon shape file which are available in point file. I am using ArcGIS (ArcEditor)...
1
vote
1answer
60 views

Calculate location on line with known azimuth to point

I have the following situation (consider distances up to 300m - without great circle etc. affects): How can I calculate the unknown location when I have all other locations in the triangle and ...
2
votes
2answers
76 views

Feature Geometry/shape changed event in arcObjects

I have a feature class(polyline). there are 5 features in the feature class. I want to get notification when user changed property any of feature of feature class. How it can be achieved ? I am using ...
2
votes
1answer
124 views

Can a PostGIS table or view have two geometry columns?

I am just wondering if it is possible for PostGIS to have two geometry columns. I use shapefile a lot, which has only one "Shape" column for geometry and all geometries in that column has the same ...
2
votes
1answer
61 views

Removing Interior and exterior polygons using arcpy

I have a polygon layer that has donuts and also exterior parts. Using python, I am able to get access to each part, but what I would like to know is using arcpy, once I have a part, how do I go about ...
0
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0answers
96 views

How to bind event to Polygon inside polygon in google maps.?

I am drawing a polygon buffer in google maps api v3 and finding number of polygon objects lying inside it.(on click) I am using oracle spatial database. on each child polygon click i need to do some ...
2
votes
1answer
307 views

Cesium JS Line Length

Is there a method to return the length of a Cesium JS polyline, in real-world units? For example, if I create a polyline: var orangeOutlined = viewer.entities.add({ name : 'Orange line with ...
5
votes
2answers
3k views

How to update geometry in ArcObjects?

I'm just starting with ArcObjects and I want to update coordinates of geometry vertices. Specifically, I want to swap X, Y coordinates for each vertex of polygons (which can be multipart and have ...
2
votes
1answer
72 views

Use Postgis to convert wkb_geometry data type to geom datatype

How would I write an ALTER statement or otherwise to convert an existing imported data column from " wkb_geometry geometry(LineString,4326)" to a geom data type? I ask because I've moved to ...
4
votes
2answers
121 views

What is the correct syntax for the geometry object's “intersect” method in ArcPy?

I'm building a script that utilizes the intersect method of the geometry class so that I can run an intersect analysis on individual polygons within a feature class. As stated here, "intersect (other,...
3
votes
1answer
48 views

using a linear solver to get a “centre of gravity” of a set of points

As a programmer, if I have a linear solver available. How can I formulate the following problem as a set of constrains / decisions / goals for the linear solver? I have a matrix of say 10*10, so 100 ...
4
votes
1answer
113 views

How to create trigger to check geometry validity?

I want to create trigger to check geometry validity in spatial table. I have a table: CREATE TABLE vec_geometry ( id bigserial is_valid boolean, invalid_reason character(128), geom ...
0
votes
0answers
123 views

How to add the geometry to google maps from geojson(retrieved as json) for a specified condition using javascript

I have a array called place_names which holds some place names. I have a GeoJSON layer loaded in CartoDB, which has three columns id, name and the_geom (which is a geometry object) that can be queried ...
1
vote
1answer
185 views

In PostGIS: how to split linestrings into their individual segments?

I have one table with many linestrings and I want to make a new table containing the individual segments of all the linestrings, no matter if they are grouped line per line or not. This is my table,...
5
votes
4answers
2k views

Any .NET library to calculate polygon area?

Is there a .NET library to calculate area enclosed by polygon made up of geo coordinates (lat longs)?
1
vote
1answer
74 views

Error when writing polygon feature

I have created this array: array = ([arcpy.Point(-103.85769159, 32.181106371), arcpy.Point(-103.85769159, 32.182755629), arcpy.Point(-103.85575241, 32.182755629), arcpy.Point(-103.85575241, 32....
1
vote
2answers
257 views

Error while Geoprocessing with Geometry Objects

I'm trying to use the distanceTo() mehtod to return the distance between the centroid of a polygon and a line, but I keep getting this error: "AttributeError: 'Point' object has no attribute '...
1
vote
2answers
484 views

Calculating minimum/maximum width for overlay of two polygon strips in ArcGIS or some Opensource GIS

Is there some solution for calculating minimum and maximum width for overlay of two polygon strips? When I clip these strips the result is another strip with variable width about 1 km and 20 km long. ...
1
vote
1answer
42 views

Arcobjects ConstructBuffers produces Error -2147220889?

I use the Esri-function ConstructBuffers in my arcobjects program. The call of this method produces a Error with code -2147220889. Looking up the error constants it says: ...
7
votes
2answers
177 views

Why do I get different results from PyQGIS feature.geometry().type()?

On the python console in QGIS what is the difference between the following two code snippets (activeLayer is a polygon layer): # 1) iface.activeLayer().selectedFeatures()[0].geometry().type() >>...
0
votes
0answers
26 views

Geometry Location In Respect To Another Geometry

I am trying to figure out where a geometry is residing in respect to another geometry. My Image explains things better, I have Square nodes A, and B. and I have circle Child nodes X, and Y. I have all ...
2
votes
0answers
38 views

C/C++ function to return minimum set of points required to represent a geometric shape

I am looking for a method from Grass, GEOS, or similar that will delete those points in a geometry which do not affect its shape. Example 1 +----+----+ p0 p1 p2 p1 can be deleted without ...
1
vote
0answers
46 views

Using arcpy.Geometry() and attribute table?

I have Polygon layer (*.shp) and I need to calculate shortest distance between every polygon's and save it into a txt file with ID (it is in attribute table) for every polygon. example of txt file - ...
2
votes
2answers
369 views

Calculating bounding box of given set of coordinates from Leaflet Draw?

I have values generated from Leaflet Draw plugin that look like this: { "type": "Feature", "properties": {}, "geometry": { "type": "Polygon", "coordinates": [ [ [-73....
0
votes
0answers
40 views

How to query Tiger Data for Layers?

I am new to this. I have data downloaded from ftp://ftp2.census.gov/geo/tiger/TIGER2015/ and I would like to learn more about how I can query that data for the different layers it offers. Here is ...
4
votes
3answers
4k views

converting/parsing geojson into com.vividsolutions.jts geometry

Does any has any experience with converting string geojson into com.vividsolutions.jts geometry object (point, polygon, etc). Maybe there is some java library I cannot find. Greets!
3
votes
1answer
94 views

When validating geometries, what are “Nested shells”?

I am validating shapefiles polygon geometry using shapely, and have also attempted it using FME. Some polygons return the error "Nested Shells". I cannot find a definition of what the problem is, ...
1
vote
1answer
70 views

QGIS crash while delete duplicate geometry

I have a polygon shape with nearly 60 000 features (at around 3 000 square kilometres) in QGIS 2.12. I try to delete duplicate geometries from this layer and the algorithm runs until 99%. Then QGIS ...
1
vote
1answer
51 views

Spatial ETL for MutliLineString [closed]

I'm pretty new to Spatial ETL. In accordance with this question I have experience the geokettle v3 but unfortunately i'm having a several problems working with it. There is some issues that aren't ...
2
votes
1answer
792 views

arcpy Geometry tools give incorrect results?

I'm new to python and arcpy but I've been trying to learn how to run geoprocessing tools using arcpy. I have (for this example) 2 shapefiles, a and b, which are both polygons. From plotting them in ...
0
votes
0answers
22 views

Transforming OpenLayers.Geometry

I have OpenLayers.Geometry objects (point, multipoints, polygons etc) with longitude and latitude coordinates for WGS-84 ellipsoid Earth model (for OpenStreetMap). These objects are properly displayed ...
4
votes
2answers
345 views

fixing polygons with “ring not closed” errors

I have a shapefile with a single Polygon feature. This feature has a "ring not closed" geometry error (seen here in QGIS): I tried using buffering and the GRASS v.clean command as suggested in other ...