A portable representation of a geometry value as a contiguous stream of bytes

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2
votes
2answers
27 views

Why does psycopg2 “SELECT ST_AsBinary(geom)” return “<read-only buffer…>”?

I'm trying to retrieve polygons out of a postgresql database and I'm running into several problems. First, I've been able to get ST_AsText(geom) to work in conjunction with arcpy.FromWKT(), but the ...
1
vote
1answer
27 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 ...
0
votes
0answers
17 views

OGRGeometry::exportToWkb return buffer empty

I would like to export OGR Geometry in WKB format. I used the function OGRGeometry::exportToWkb from OGR. The problem is that the buffer returned by the function is empty and OGRERR_NONE is always ...
2
votes
0answers
51 views

Is there a Tiny Well-Known Binary (TWKB) implementation in C#?

I am aware of https://github.com/TWKB/twkb.js and I'm looking at evaluating Tiny Well-Known Binary (TWKB) in a c# application. I did some googling but came up empty. Are there any efforts underway ...
0
votes
1answer
326 views

Understanding the format: WKB from WKT and how to convert the first into the latter

I don't understand which kind of format I have my data. The column name is wkb_geom, so I supposed that data were in WKB format, but then I was checking around and I couldn't find example of it. Data ...
2
votes
1answer
91 views

I can't understand this ewkb type mask

I have the following ewkb strings from PostGIS: 01 01000020 E6100000 AECB9307F9D81240 0F2ADCE003704940 01 01000020 E6100000 7EAA0A0DC4920DC0 5AF0A2AF201F4440 I've been able to understand every data ...
0
votes
0answers
128 views

Working with Google Maps Android API v2 and WKB

I have a service which returns a list of routes (geometrycollection of linestrings) in WKB format. I want to display the routes on the google maps android api. What's the right way to achieve that? ...
0
votes
0answers
68 views

GeoServer GeoJson with coodinates in WKB?

I'm using a GeoJson query to GeoServer to update data in existing sqlite database used in an android app. The geometry column in that database is in WKB format, because like this the database is ...
0
votes
0answers
55 views

QGIS Import WKB csv file

I have a csv with a unique field that are the coordinates of thousands of points but in WKB format. How can I import all the features into QGIS? CSV file is like this: ...
1
vote
1answer
81 views

Android library to show wkb

I would like to use open street map to show data from wkb file(wkb + some extended attributes). I have found out that wkb file is possible to read/query using spatialite. But i dont know how to ...
0
votes
0answers
73 views

strange result of spatial functions postgis

I have a problem with different result of spatial functions for same geometry. For some reason result I get when I use geometry from database is different then result when I load same geometry from ...
2
votes
0answers
287 views

QGIS : cannot change the z-coordinate of a point shapefile using the wkb geometry format

I am using QGIS Desktop 2.5.0-Master with GDAL/OGR 1.11.0 on a windows 7. I am working on a little pyQGis script that should modify the z-coordinate of points in a vector shapefile based on a value ...
2
votes
1answer
326 views

Transform wkb to gml geometry using FME

Maybe (and probably) this is stupid question, but I am totaly new to FME and geometry conversion. I need to transform WKB field from SQLServer to GML geometry using FME software. How can I do this?
2
votes
1answer
2k views

Is it possible to get a binary geometry from PostGIS?

PostgreSQL (via C# Npgsql driver) returns geometry column (PostGIS) like a hex string (EWKB as I understand) for this query: SELECT ST_Transform(geometry, 4326) FROM myGeometries; Result (for ...
4
votes
3answers
3k views

PostGIS: parse geometry wkb with OGR

I'm trying to pull a LineString geometry out of PostGIS and parse it with OGR (python bindinds). from osgeo import ogr import psycopg2 connection = psycopg2.connect("...") cursor = ...
0
votes
2answers
1k views

Converting WKT to WKB

How can I convert a WKT string to a WKB byte[] in Java using postgis functions? I need to save that WKT string in a postgis database (geometry column. Thanks
-1
votes
2answers
216 views

How to convert WKB to radians or utm in postgresql?

I am using PostgreSQL with postgis, the geometries are in UTM and stored as WKB with several shapes types (point, polygon, linestring...). Is there a way to convert the WKB to a list of points in ...
2
votes
0answers
132 views

PyQGIS - Converting WKB to String

Using PyQGIS, i'd like to print the string representation of a point WKB (like what PostGIS displays in geometry columns). For example: p = QgsGeometry.fromPoint(QgsPoint(2, 4)) wkb = p.asWkb() print ...
0
votes
1answer
285 views

Probably base64 encoded WKB - Reading in QGis/ArcGIS?

I have a probably base64 encoded WKB string. How would I load that feature represented by the string into QGis or ArcGIS? I found the QGis QuickWKT plugin, but that does not handle my base64 encoded ...
2
votes
2answers
738 views

Import Points with WKB format to QGIS

I have a .csv file with population data according to specific locations (Points). My problem is that all locations are given in WKB format like that: ...
6
votes
6answers
2k views

WKB to WKT JavaScript function

Turns out json isn't so good at transporting binary data. But with HTML5, XHR2 is now capable of transferring blobs cleanly. I'm looking to transfer binary geometry (to save bandwidth) and decode it ...
3
votes
1answer
278 views

How can I get KML into JTS TestBuilder?

JTS Topology Suite TestBuilder supports WKT, WKB and GML inputs. What's a quick and easy way to get the geometry for a KML feature into one of these formats for input into JTS TestBuilder? For ...
3
votes
1answer
249 views

OGIS Ole Db provider sample with read/write capability

I'm trying to determine what level of effort would be required to develop an OGIS Ole db provider for ArcGIS. There is a sample that is read-only. I would like to be able to edit featureclasses in ...
1
vote
0answers
65 views

Converting geometry_dump to Point geometry vertex

If this was a Point geometry 010100000001DE02098A1B52C090A0F831E62E4640, is it possible to represent the above geometry_dump Point Vertex. I am trying with St_collection...,
2
votes
1answer
194 views

How do I export circles from ArcObjects to WKB?

I have a small circle in SDE which I'm trying to extract through ArcObjects into well-known-binary (for later import into other systems). Using the IWkb interface I can obtain the WKB, but it comes ...
4
votes
2answers
1k views

A bug in ESRI Line Geometry WKB that adds needless, trailing 0's behind otherwise valid WKB?

[Update 7.13.2012] My coworker noticed the the ESRI Line WKB is malformed contains unspecified trailing data, and since he's not active on GIS.SE, I posted his remarks as an answer. I'll wait a few ...
2
votes
0answers
742 views

Spatialite - get geometry from WKB

I have a table of WKB HexString values, of the form: 01010000000812368FA5D106C01C25B4DAE5AE4A40 in a column called 'Centroid' in spatialite I want to create a geometry from these values. When I ...
4
votes
2answers
658 views

How to generate an image from WKT?

I am looking to programatically generate an image from a WKT string (or any other common format, such as WKB or SQL Spatial geography). Are there any existing libraries that allow for this? I am ...
7
votes
1answer
2k views

How to convert Shapefile geometries to WKB using OGR?

I got the geometry of a feature of the shapefile, and i want to save that geometry in the postgis (in WKB formats like it happens when we import shapefiles using shp2pgsql and psql commands). How do I ...
3
votes
1answer
548 views

Building WKB from geometry using ArcObjects?

I have some points in an array,stored by user click on the map in ArcMap,and I want to build a polyline and create a Well Known Binary sequence. I use IPointCollection interface to add this points to ...
3
votes
4answers
8k views

How to convert WKB to WKT?

how can i convert wkb to wkt form ... i stored coordinates in wkb but now can it will display to use in wkt form
2
votes
2answers
599 views

wkb/wkt according to OGC

how can i store my coordinates in wkb.. i want to know its implementation of wkb and wkt in db .. any one can please guide me.