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

learn more… | top users | synonyms

1
vote
1answer
1k views

How to resolve the postgis “type geometry does not exist” issue on installing tiger_geocode extension?

I have installed postgis extension in my db. I have few columns associated with its type in few tables and now I would like to use reverse geocode functionality in my app. Hence I tried to create ...
2
votes
0answers
48 views

how to register view geometry made by MakeLine function?

I am trying to to create a spatial view on my spatialite database. CREATE VIEW v2_pump_view AS SELECT pump.ROWID AS ROWID, pump.id AS pump_id, MakeLine( ...
6
votes
2answers
401 views

Draw SQL server geometry records as graphics on map using ArcGIS API for WPF 2.4 -can it be done and how?

I have records (of public festivals changing daily) in the in SQL server 2012 that have a geometry column (polygons where they occur). I need to show the records as graphics on a map using ArcGIS ...
1
vote
2answers
35 views

Geographical Field Points of a Boundary

I gathered field points with a TOPCON hand held receiver. I saved the points as a shape file and brought them into arc map. I used the editor tool to connect the points and created a polygon. Is ...
3
votes
2answers
104 views

Construct curve of equal distance from two straight lines

Given two straight lines defined by two points each, I want to get the line which separates points nearer to line a from points nearer to line b. The attached PostGIS code is an example case, it finds ...
0
votes
0answers
33 views

PosGIS: Longest line connecting point to line

I have a point and around it lines and polygons in the rule of obstacles. I want to connect the point to each of the lines, with a line, such that this connecting line is not intersect any obstacle (...
1
vote
0answers
44 views

sql server geometry find points intersection buffer

How do I find the point of intersection of buffer?
1
vote
1answer
89 views

GeoTools Geometries lost when storing features to shapefile [duplicate]

As you know, the geometry column name of schema for saving into a shapefile must be "the_geom". I have a SimpleFeatureCollection with a schema, geometry name of which is not "the_geom"; It is "...
2
votes
1answer
109 views

Testing if Geometry is convex using JTS?

I'm using the Java Topology Suite and I'd like to efficiently check if a Geometry (a Polygon in fact) is convex or not. I currently do if (geometry.convexHull().equals(geometry)) but obivously that ...
0
votes
0answers
14 views

Representation of streets/highways Geometry

I have Navtech data which provides center-lines with geometric data of the roads. The most important data for me is that it gives me the width of the road as well as the number of lanes for most of ...
0
votes
0answers
202 views

Drawing Zoning Setback Lines

What would be the process for drawing zoning setback lines for a property parcel polygon? I'm looking for a software agnostic solution - just a walk through of the general steps with enough detail ...
1
vote
1answer
51 views

Looking for geometries defining the boundaries of Canadian Location Code regions used for Meteorological Services in Canada

To be clear I have looked into the GADM datasets. The problem is that Canada has a very non-standardized level-2 Administrative Zone identification across the various Territories and Provinces. As a ...
0
votes
0answers
86 views

Remote SQL Server, Crystal Reports and Geospatial Join

I have: A remote SQL server (2008 R2) that I have access to (But NOT full control of) which contains my source data including OSGB 1936 Geometry [ESPG: 27700] In house SQL Server 2008 R2 A Crystal ...
0
votes
1answer
39 views

Double geometry coloumns in an xy event layer (ArcGIS 10.0)

I want to convert an annotation feature class to a shapefile. The annotation feature class is stored in a file geodatabase. I add two columns (x, y) for the centroid coordinates (calculate geometry) ...
1
vote
1answer
55 views

sorting polygons extracted using Fishnet

I generated polygons using fishnet in ArcMap, since the polygons didn't fall exactly on top of my raster image, I had to edit and move some of them. Now the FID of my polygons are all messed up, and ...
0
votes
0answers
142 views

How to create a polyline using multiple points using a PostgreSQL query?

I'm trying to use point data to create a polyline to show my bus route. Initially began with coordinates and used this to create geom using the ST_MakePoint function (written to the BusRouteData table)...
1
vote
0answers
21 views

QGIS 2.0.1 Translate Feature

I have a layer containing linestrings and want to move those that are too close to each other. I seem to be missing something in the moving part though: layer = iface.activeLayer() def moveFeature (...
2
votes
2answers
160 views

Merging lines (that might cross) at common endpoints without multi-part features in the result

I have a polyline dataset I'm trying to merge / dissolve segments based on an attribute into continuous single lines. The problem is that some of those segments cross each other but need to be ...
9
votes
2answers
94 views

Fuzzy least-coarse common partition algorithm

Given two different partitions of a shape (for argument's sake, two different administrative divisions of a country), how can I find a new partition into which both of those partitions fit, allowing ...
0
votes
2answers
96 views

Using ST_LINE_INTERPOLATE_POINT in OGR and python

I'm interested in finding the midpoint on a linestring using OGR and python. This can be a line with more segments. Could I use the ST_LINE_INTERPOLATE_POINT in python using the ExecuteSQL() method? ...
2
votes
0answers
116 views

how to orthogonalize building outlines

I'm looking for a way to orthogonalize building outlines which I've extracted from a high-res DEM. I'm using the FOSS GIS stack (QGIS, GRASS, SAGA, PostgrSQL, PostGIS) and can code in Python (or Java)....
1
vote
0answers
40 views

Geometry Calculation in QGIS [duplicate]

I'm trying to calculate the area of some census tracts in qgis I go to vector -> geometry tools -> export/add geometry columns in the resulting dialog, I calculate using project CRS. What comes out ...
1
vote
0answers
26 views

WFS Updating a geometries points

I'm trying to work out on how I can insert or overwrite points that are stored in a features/ Layer? I've created a String/Text document which is already converted into GML/XML ready to be pushed to a ...
1
vote
0answers
26 views

line from min to max of a digital elevation model

I have some geometries as multipolygons and a dem (digital elevation model). I need a line from the max value to the lowest value of the dem for every multipolygon. Is qgis a tool i could use or do i ...
1
vote
2answers
119 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 ...
5
votes
2answers
306 views

Cutting a circular buffer via Arcpy

I am currently working with compressor stations on centerline routes. These compressor stations have a 3 mile buffer surrounding them. I wish to cut a portion of the circular buffer off. These cut ...
0
votes
1answer
178 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 ...
3
votes
0answers
636 views

C# implementation of concave hull / alpha shapes

I'm looking for a C# implementation of the Concave hull (alpha shapes) algorithm. I already found several Java, Python and C++ implementation but no C# version. The other implementation are quite ...
0
votes
0answers
183 views

Explanation of the Thinness ratio formula?

I am looking for sliver polygons and am using the following formula to identify which polygons have a smaller area-to-circumference ratio (aka Thinness Ratio): 4 * pi * area/(length*length) That ...
1
vote
0answers
26 views

Forcing area calculation into miles in QGIS (without changing the PCS) [duplicate]

I'm working on an assignment that requires me to create an area column in miles without changing the projected coordinate system. ArcGIS has a tool that can do this ('Calculate Geometry')-- does QGIS ...
0
votes
1answer
19 views

Plotting on MAPinfo given edge geometry in a row

I have a file of road geometry of the Washington State downloaded from GIS cup 2012. Each row in the file is of the type, 5,service,15.9316766209136,47.2981713,-122.2481928,47.2981800,-122.2482596,47....
1
vote
0answers
193 views

How to determine ring orientation from lat/long coordinate points?

We have some set of point coordinates in lat/long which contribute to a polygon. From this set how do we determine the polygon is clockwise or anticlockwise?
1
vote
1answer
111 views

How to insert non-spatial features into a Polygon shapefile - FME 2015

Here is the issue: I have the original data (a shapefile with spatial a non-spatial features) which I need to transform: (highlighted those non-spatail features) I need to make some ...
1
vote
1answer
123 views

Clarification about Trilateration

What is the method used by wikipedia to solve Trilateration problem, is it the Linear Least Square? or is it just a direct solution of a set of linear equation systeme with exact distance? but in this ...
1
vote
2answers
264 views

Geopandas: counting the number of raster pixels within a shapefile polygon

I have a shapefile that I have loaded as a geopandas dataframe, and it has a geometry column containing polygons and multipolygons. My end goal is to do some zonal computations on a GeoTiff raster, ...
1
vote
1answer
170 views

spatialite : spatial index on geometries

I'm currently learning to use spatial access methods for query optimization. I'm going through the examples in spatialite cookbook and got stuck in here http://www.gaia-gis.it/gaia-sins/spatialite-...
0
votes
2answers
200 views

Create point on a line with given distance from end in PostGIS

Does anyone know how to create points along a line (MultiLineString geometry) with a given distance in PostGIS? I'd like to create points at a regular distance over a line, which represents a ...
1
vote
0answers
336 views

Efficient way of determining polygon intersection with bounding box

I have a set of polygons, and I need to check whether they are intersecting with a given bounding box(rectangle). What I am doing is, I am taking every vertex of polygon and checking whether it's ...
1
vote
1answer
2k views

Google's S2 library - any alternatives? [closed]

Is there any alternative to Google's S2 geometry library? It looks it was updated 4 years back and hardly any documentation. I need a library to divide cities into zones of the area I need. S2 looks ...
2
votes
1answer
57 views

Creating PolylineZ in arcpy

The script below is slightly modified "Polyline example" from ArcGIS help http://resources.arcgis.com/en/help/main/10.1/index.html#//018z00000008000000 import arcpy # next 3 lines are new from arcpy ...
0
votes
1answer
102 views

How to get arcpy to access attributes of a geometry?

As a novice python programmer I am struggling mightily with my code. What it is supposed to do is Buffer a bunch of points with four distances (100, 200, 300, 400meters) Calculate zonal sum for ...
1
vote
2answers
1k 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?
3
votes
1answer
192 views

Using arcpy to find geometry within another feature

In Arcpy, I would like to start with a point and then using its geometry method to find out if it is inside my polygon feature (Urban Areas) deeper than the buffer distance. This is a follow up to ...
2
votes
1answer
71 views

How to know if two geometric figures are approximately equal?

I would like to know how to determine if two geometric figures (the_geom) are approximately equals. By the way, I'm working with Python, PostgreSQL and Postgis I have the following geometries: ...
0
votes
1answer
1k views

Using WKT.writeGeometry for 'Circle' Geometry in OpenLayers?

In my application which I'm building using OpenLayers3, I'm trying to extract the geometry of a feature to WKT using var format = new ol.format.WKT(); console.log(format.writeGeometry(geometry)); by ...
0
votes
0answers
122 views

Drawing boundaries between discrete features based on attribute values in ArcGIS for Desktop?

There is a point feature class with a certain numeric attribute (let us say, populated places with population). I wonder if there is, in ArcGIS, a way to draw polygons such that the sum of the ...
1
vote
0answers
58 views

Zonal geometry output in ArcGIS

Is there a way to specify the coordinate type in Zonal geometry output in ArcGIS? I am trying to perform zonal geometry on a raster and in the resulting output, the XCENTROID and YCENTROID are in ...
0
votes
0answers
99 views

Joining the tables with the geometry

I have a large table (as a shapefile without geometry, just set of records) with data which has the refference to the other tables (as a shapefiles with specific geometry, reference as same ID's for ...
0
votes
2answers
61 views

How can I find internal overlaps in my polygon feature class ideally via modelbuilder tools?

I have a polygon layer containing "depth curves" for the making of a skin of earth kind of map. I want to check whether or not my feature class contain any overlaps internally between these polygons. ...