(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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28 views

ArcGIS Desktop: Not Rendering Line Data but Web Service Outputs Fine

I have some script which read .JSON files through .NET and then inserts the data into a SQL Server database. The data's Geometry is of the type esriGeometryPolyline ; basically, they are floor plans ...
3
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26 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 ...
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34 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 ...
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37 views

Using custom shape files as buffers in ArcGIS [closed]

I would like to use a custom shapefile as the buffer shape for a project that I am working on. I have created a buffer around a compressor station of 3 miles and am planning to clip the lines that ...
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25 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 ...
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1answer
16 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, ...
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0answers
58 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?
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1answer
47 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 ...
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1answer
21 views

SQL Server Geography Query works but Geometry Query Does Not - Different Tables, Similar Schemas

I am trying to get a Geometry query to work. A similar Geography query works fine but I must work with a table that uses a Geometry type. Although the Geography version returns lots of records as ...
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1answer
33 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 ...
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1answer
54 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, ...
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1answer
42 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 ...
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2answers
31 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 ...
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67 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 ...
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74 views

Google's S2 library - any alternatives?

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 ...
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1answer
22 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 ...
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1answer
55 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 ...
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1answer
47 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?
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1answer
73 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 ...
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1answer
46 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: ...
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1answer
143 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 ...
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51 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 ...
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36 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 ...
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41 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 ...
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2answers
44 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. ...
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34 views

Points contained in envelopes that cross date-line - java

I'm using the ESRI Geometry Java API https://github.com/Esri/geometry-api-java I want to construct an envelope and see if it contains certain points. It's possible the envelope crosses the ...
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44 views

Reverse parameters of a projection map

I'm user of a soaring simulator named "Condor Soaring". This simulator is at the center of a community of enthusiastic people who build sceneries (landscapes) which represents quite accurately real ...
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1answer
49 views

Unable to read different kind of shape files

I have written the java code to read the shapefile and insert it into the table. But the way I have written code it will accept only a multistring .shp file. It fails for other shapefile geometry ...
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1answer
230 views

Store a GeoJSON FeatureCollection to postgres with postgis

I am new to GeoJSON. I have a GeoJSON features collection as shown and would like to store it in postgres table (testtable). My postgres table has a serial id and geometry column. { "type": ...
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1answer
68 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?
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40 views

Transforming GIS based XY data (polygons) so that they overlap in R

So I'm attempting to come up with the average shape of these polygon features as a part of my masters research. To do this, I want to run a shape analysis of GIS-based X-Y data using the shapes ...
2
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1answer
81 views

QGIS Python - raster as point layer, coordinates issues

I would like to create point layer for storing values retrieved from a raster file. My idea was to iterate through all raster cells. If cell value is different than NULL, I wish to create a new point ...
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2answers
63 views

Could not translate dgn geometry to esri fgdb

I am trying to import geometry in dgn file to a point feature class in arcgis file geodatabase. I have a layer in dgn file 'baum' which bascially means trees. I want to store these features in CAD ...
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5answers
185 views

How to add a point to existing attribute record, rather than edit attributes of an existing point?

I'm using ArcGIS 10 to create point data. Normally I would start an edit session, select point as a construction tool, click where I want a point to be, and then go in and edit the attributes. Say I ...
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1answer
54 views

Extracting specific geometry point from MultiPoint geometry using PostGIS?

I am working with multipoint geometries in postgis and would like to extract the geometry point associated with the greatest y value of the multipoint geometry. How may I accomplish such a task? For ...
2
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1answer
37 views

TSQL Geometry Query Requires conversion to string

If I specifically define some polygons and check for containment, I get a correct result: DECLARE @g geometry; DECLARE @g2 geometry; SET @g = geometry::STGeomFromText('POLYGON((407305 100826.5, ...
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1answer
83 views

Convert string column back to geometry column?

I had a table with a column set to 'point' in doctrine2, but this was changed to 'string' and updated. I can't change it back to 'point' in doctrine2, I get an error: ...
2
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1answer
61 views

Geometry in QGIS 2.6

This might be a beginners question, but I could not find an answer on the internet. I drew a couple of polygons in a vector layer and I am trying to get some basic geometric information into my ...
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2answers
54 views

Postgis: Query ST_DWithin in square instead of circle

The ST_DWithin query queries all geometries within a certain radius from another geometry (in my case a point). For performance optimization of my application I want to query in a square. So that the ...
2
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2answers
105 views

How to handle coordinates accuracy in ArcGIS

I am creating very basic rectangular polygon using very basic a Python code nCols,nRows=100,100 corners =[[0,0],[0,nRows],[nCols,nRows],[nCols,0],[0,0]] ...
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1answer
26 views

problem in PostGIS Name of the system used for Points and how to get distance between to point?

I have started to work on a project in PostGIS. I have a table with a geometry points in which points saved like this : "010100000089F511C671C01E4162327E2A83545341" and I have translated this ...
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1answer
74 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":[ ...
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0answers
15 views

postgis 2.x geometrycollection and multi

I want to gather differents geometries in a table. So I transformed a multipolygon geometry in a geometrycollection. Now if I can insert differents geometries, I lost the capability of insert ...
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0answers
41 views

JTS Geometry to GML3.1 encoding

I searched all the internet and I didn't find a solution to my problem. I want to convert a JTS geometry to a GML3.1 geometry. Geo tools says that have support but the have not (please check encode ...
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0answers
114 views

Convert java.vividsolutions.jts.geom distance to meters

I am using com.vividsolutions.jts.geom to perform the distance calculations. I have a list of "LineString"s and a Point (Say A). I want to determine the The nearest LineString to the Point A. The ...
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0answers
18 views

Creating density layer after calculating one value based on two variables?

I have a map of census blocks and the population of each block for an island. I also have a map of the tax map key (TMK), broken down into land parcels, with the dollar value of each land parcels. I ...
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1answer
67 views

ArcGIS geometry update from table XY

I am trying to update the geometry of a point FC stored in a FileGeodatabase using ArcPy. I got this Python script to compare the values of the SHAPE@X and SHAPE@Y and change the Geometry if not ...
4
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1answer
71 views

Calculate distance from all points to all lines within 10km using FME?

I have a polyline shapefile and a point shapefile. The points are along the polylines. There are over 100 lines and over 10,000 points. I want to calculate the perpendicular distance from every ...
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0answers
79 views

Inflating the boundaries created with convex hull

I have a set of lan and lat points and have plotterd a convex hull for them using QGIS. A polygon is created along the set of points and plotting them on the MAP. Now I am trying to inflate the size ...
6
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1answer
392 views

How to compute Straight Skeletons using Python?

Is there a Python package which provides an implementation of a Straight Skeleton algorithm? I'm aware that the open source (C++) project CGALcontains an implementation but it seems like ...