Well-known text (WKT) is a text markup language for representing vector geometry objects on a map, spatial reference systems of spatial objects and transformations between spatial reference systems.

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How to transfer a WKT string from OpenLayers to Geoserver or PostGIS?

Supposing I have created a Vector Layer in OpenLayers and then transformed it to WKT or GeoJson, how can I export it from OpenLayers, and possible import it to PostGIS or GeoServer?
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520 views

Project WGS84 to Google using MapGuide and WKT

I'm having trouble projecting a simple WGS84 formatted layer over google maps. I can't find a good WKT "API" that not only shows parameters, but explains what each parameter is. The coordinate system ...
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209 views

How to change 0,360 WKT string to -180,180?

I'm reading POLYGON WKT strings using OpenLayers.Format.WKT().read(). The polygons use 0,360 longitudes but my map is -180,180. When I display the polygons on the map they are displayed outside of the ...
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65 views

Online WKT and GeoJSON viewer

I once found a great but simple webpage that has a drop down with several text-based GIS formats such as GeoJSON and WKT, and a text box to copy/paste your data. The feature is then drawn on a world ...
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Looking for a pythonic way to calculate the length of a WKT linestring

I was quite unsatisfied with Calculating Length of Linestrings in WGS84 in Miles. It kept me wondering if there is a more convenient, Pythonic way to calculate the length of a WKT linestring according ...
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Openlayer is very slow when using WKT Multipolygon with a large number of Points

I'm showing the boundaries of cyprus regions using openlayers with vector layer, I get the coords from a shapefile which has a lot of points, for instance some regions can have a multipolygon with in ...
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890 views

OpenLayers create marker (feature with icon) from WKT

I have a point object WKT. Like this: POINT (25.04568 48.221548). Also I have an icon in my project folder. My goal is to show on a map an icon that represents a feature. Can it be just a normal ...
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39 views

R PostGIS convert SpatialPolygon to PostGIS table

I've been having some success in scraping some webdata and converting it from HTML to spatial data as originally asked here: Parse PHP/HTML to shapefile or similar I've been using R to both fetch the ...
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Iterating polygons on a SpatialPolygonsDataFrame in R with readWKT

I have fetched some data (39 objects) from my PostGIS database and converted this data into a matrix: rs <- dbSendQuery(con, "SELECT ST_AsText(polygon_accumulation) AS ShapeWKT from ...
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44 views

Java library for reading geojson from MySQL

I am looking for a way to retrieve mysql geometry data as geojson from the database either using a java library or for converting wkt to geojson using either java or javascript. Currently I am doing ...
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11 views

Is OpenLayers compatible with OGC WKT SRS definitions?

I'm trying to use WKT in OpenLayers. Proj4js seems to have no problem with this but the OGC definition describes the units as "US survey foot" whereas OpenLayers has an INCHES_PER_UNIT definition of ...
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61 views

Convert series of WKT to Shapefile

I have seen am ability in SQL Server 2008 Spatial Tools here that saves result of query as shapefile..I am intrested in how to do this task using C#..Is there any way to do this?I found ways to ...
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66 views

Convert WKT (or geojson) geometry to numpy array of coordinates

I am looking for the fastest way to convert WKT or geojson geometry from string to numpy array of coordinates. Is it possible to do it strictly in Python and without creating geometry object such ...
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1answer
39 views

WKT: What is the reasoning behind the concept of a POINT EMPTY?

In data formats like WKT and WKB, we have ways of representing "empty" geometries. That all pretty much makes sense: a "LINESTRING EMPTY" is a LINESTRING type with 0 vertices. Same with a MULTIPOINT, ...
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175 views

Returning string from OpenLayers.Format.WKT write? [closed]

How to return a string from OpenLayers.Format.WKT write this.innerHTML = new OpenLayers.Format.WKT().write( layer.selectedFeatures[0] ); my full code is like this please suggest me... ...
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38 views

extract vertices from dbgeometry value

Who knows the elegant way to extract coordinates of polygon vertices from well known text representation of DbGeometry value? Here's my polygon for example: {POLYGON ((52.808019 -1.345367, ...
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Failing to get wkt to reference for a multiline

I apologize, I'm quite new to WKT (and most everything else). I have a shape that I've exported to csv. & geoJson to be loaded into CartoDB. Unfortunately, the geoJson doesn't work so I am trying ...
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75 views

How can I convert WKT to SHP?

Using ArcGIS, ArcInfo and fme, I would like to transform data which contains wkt geometries (points, lines and polygons) into SHP. Has anyone a workflow for doing such a transformation?
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Is there a limit to the number of polygon points you can export to CSV in QGIS 2.4?

Using QGIS 2.4 I am currently importing a csv file with ~30,000 polygons (polygons in WKT format). I also have a United States shapefile. I have used the Clip function to get only the polygons that ...
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79 views

How to create WKT file readable by QGIS 2.4.0

I am trying to create a well-known text (wkt) file that can be imported into QGIS ver. 2.4.0 Here's a minimal working example of the geometry I wish to represent. POLYGON((-125 52, -125 21, -98 21, ...
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4k views

Converting 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
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How to unproject WKT to WKT in .NET?

I have WKT in this format: GEOMETRYCOLLECTION(POLYGON((491990.250718 6212873.59755,491492.160493 6212904.94117,491265.64715 6212790.54445,491319.517251 6212550.36334,491579.624164 ...
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55 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?
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EPSG codes and water level datums

I'm curious if, and how, people use EPSG defined water level vertical datums such as Mean Low Water. There is specific guidance to not use the OGP EPSG definition: Remarks: Users are advised to ...
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Reproject WKT Polygon with Javascript

I have a polygon in WKT in EPSG:4326: polygonWKT = 'POLYGON((13.215179443359373 52.588032137196755,13.42803955078125 52.592620721000365,13.454132080078125 52.46897854656702,13.347015380859375 ...
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geography, geometry, distance, and wkt - PostGIS

I'm trying to understand the data conversions that happen in PostGIS when calculating distances in SRID 4326. Why is it that when I run on my marin_jobs points table: select cast (the_geom as ...
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249 views

What are the differences between the OGC and ISO WKT/WKB specification?

Are the OGC-Simple feature access and the ISO (ISO/IEC 13249-3:2011 "Information technology - Database languages - SQL multimedia and application packages - Part 3: Spatial") significantly different ...
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91 views

Shapely WKT precision/rounding

I'm using Shapely's wkt.dumps function to get WKT from geometry objects. I can't seem to find a way to limit the precision of the coordinates. Any help is appreciated.
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50 views

Using Well-Known Text and geocoding on Load

So, I have tested adding columns with the WKT format into Carto, and it has always worked great (I tried 1 row, then 1000 random rows from our data). I geocoded it on load by naming the column with ...
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1answer
254 views

Parameter values to create a vector grid with 1km x 1km cells?

I created a shapefile from WKT in QGIS using the values from this link. I want to create a vector grid with 1kmx1km cells but I can't figure out what values need to be set for the X and Y parameters. ...
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149 views

Does OpenLayers3 support WKT format?

How can i show spatial data(Point, LineString,Polygon) on bing map using openlayer3?
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60 views

How to convert this geometry location format to a qgis usable format?

I am a beginner with regard to dealing with gis information, so please bear with me. I would be obliged if someone could help. I have data on asssembly constituencies of Delhi, with these ...
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Are there any online WKT editors?

I've been using QGIS and it's great. However, we can't use that because it has to be installed (please, don't ask). Instead, what we need to do are very simple administrative boundary drawings over a ...
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Convert between ESRI Geometry and WKT

It seems like there is no means of converting an ArcObjects geometry to the Well-Known Text representation (and vice versa) in ArcGIS ArcObjects API. The only thing I was able to find is conversion to ...
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1answer
346 views

Well-known text (wkt) validator

Is there anything like http://jsonlint.com or http://geojsonlint.com for WKT? How can I validate a complex WKT string, say e.g. a Multipolygon?
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Getting EPSG:4326 WKT data for use in Drupal Geofield [duplicate]

As I understand it, EPSG:3857 is measured in "meters" and EPSG:4326 uses latitude and longitude. In Drupal, geofield seems to want to store "EPSG:4326" data using the WKT widget -- even though the ...
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Represent full globe in Oracle Spatial

In SQL Server 2012 I can do this: -- Construct a new FullGlobe object (a WGS84 ellipsoid) DECLARE @Earth geography = 'FULLGLOBE' -- Calculate the area of the earth SELECT PlanetArea = ...
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Working with WKT data in XML File in SQL Server

Anyone have experience with importing XML files into SQL server 2008 or 2012 that have a WKT element that includes the geometry for each feature? I can get this to easily work using FME software but ...
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207 views

QGIS 2.2 saving layer as CSV with GEOMETRY=AS_WKT not working

Just upgraded to QGIS 2.2 and it looks like saving a layer as CSV doesn't support GEOMETRY=AS_WKT anymore. The new Layer Options portion of the save dialog is cool but it looks like GEOMETRY and ...
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1answer
111 views

WKT for local mine grid

I have been trying to create a WKT entry to use in gdalwarp etc. I need an affine transform from coordinates in MGA94 Zone 54 to our local mine grid. All efforts have so far failed, including using ...
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2answers
68 views

How to create path based on waypoints?

I am trying to map flight paths and compare historic paths with current ones (so I later need to perform some calculations as distances between them). For this task I am using QGIS on OSX 10.9.1 As ...
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85 views

How to export WKT with QGIS suitable for Geophp

I like to be able to import the coordinates of may polygon shape file into a php based webapplication. (drupal) However after adding coordinates in my shape file and saving it as CSV i am not able to ...
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1answer
92 views

How can I convert a csv file of WKT data to a shape file using QGIS 2.01

Is it possible to create a Shapefile directly from a csv WKT file in QGIS 2.01? WKT POLYGON(...) POLYGON(...) Save as shapefile doesn't seem to work. Thanks!
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200 views

How can I find the SRID from the WKT out of a GRIB file?

I have a grib2 file which I'm trying to import into PostGIS 2.0 Raster and process. Trouble is, I can't figure out what the SRID is supposed to be, or one close enough for government work. Running ...
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1answer
494 views

Converting wkt to geojson with OpenLayers

I am trying to convert wkt to geojson wit OpenLayers. I wrote my code based on this question (geojson to wkt). That's what I have so far, but it is not working. Any ideas? var = ...
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From where can i download WKT files for US zip codes? [duplicate]

From where can i download WKT files for US zip codes ?? i need to plot zip code boundary on a map using open layers
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Using Terraformer to convert to WKT

I'm using Terraformer to parse some ArcGIS JSON into a Terraformer primitive. I'd like to store the geometry in PostGIS for other purposes. So I'm trying to use the WKT.convert tool to convert this ...
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Trying to read string-based binary (?) code into something like WKT to be read by a spatial database

I've recently received some parcel data that has "shape" columns which are strings by default and look something like this: ...
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How to convert geometry to WKT using ArcPy?

I would like to be able to convert a single feature (or potentially many features) in an ArcGIS layer into Well Known Text (WKT) format during a geoprocessing operation using Python and ArcPy (no ...
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2answers
830 views

How to read csv with WKT geometry in Arcmap?

I have found several parcels I need on a county map viewer. However, the only option to download any of the data is found on a click context menu to "Copy selection as csv" which gives me this: ...