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Questions tagged [wkt]

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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Seeking for a solution to convert GeoTIFF to 3d WKT

I am trying to convert some DEM in .tif image to polygon geometries representing 3 dimensional triangles that is Well-known text (WKT) - 3D (x, y, z) I was able to use SAGA to convert my GeoTIFF ...
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1answer
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State Plane Scale Factor in WKT

I need to convert an old-style projection file (created with Global Mapper) to a WKT format for use in my GIS program (ArcMap or GDAL or whatever). The problem is that my old-style projection file ...
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1answer
40 views

What is the history behind WKT and proj.4? [closed]

What is the history behind WKT and proj.4 formats for defining coordinate systems? Does one have advantages over the other? Why do both exist? I'm guessing they were developed independently for ...
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30 views

Need to zoom into a vector Layer of a multipolygon

I am getting a multipolygon coordinates from DB in WKT format. I am able show the same on the map. But the problem I am facing is while zooming to center of the Multipolygon. Is there any way to zoom ...
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1answer
81 views

Getting SRID Well Known Text (WKT) metadata from PostgreSQL?

The SRID metadata is showed by, e.g., this web page: Definition: Well Known Text (WKT) PROJCS["UTM Zone 24, Northern Hemisphere", GEOGCS["GRS 1980(IUGG, 1980)", DATUM["...
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1answer
125 views

ProjNet. Coordinate reference system transformation deviation

I have a project with C# that contains a CEFSharp viewer showing a webpage with a map that I've created.I'm trying to add a marker in the map sending the parameters from C# to a function in the ...
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1answer
70 views

Pretty-printing WKT strings?

Is there a tool that will pretty-print well-known-text strings? One that would accept for instance MULTIPOLYGON (((40 40, 20 45, 45 30, 40 40)), ((20 35, 45 20, 30 5, 20 35))) and output something ...
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1answer
144 views

Create geometry from WKT in FME

How to create geoemtry from WKT in FME? We have a csv file in WKT format: "ID";"GEOM" "1";"LINESTRING ( 15, 20 16, 20 21, 12)" "2";"LINESTRING ( 15, 20 16, 20 21, 12)" "3";"LINESTRING ( 15, 20 16, ...
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Getting well known text from varchar in redshift.

As you know, redshift does not support geometry types. There is a column in a dataset on my redshift db that has varchar column and the format looks like: ...
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106 views

including SRID in WKBWriter in Shapely doesn't work

I want to encode coordinates of LineString in WKB with the SRID included wkbwriter = shapely.geos.WKBWriter(shapely.geos.lgeos, big_endian=False, include_srid=True) geo = wkbwriter.write_hex(...
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1answer
44 views

Visualising multiple points using QuickWKT plugin in QGIS?

Using the QuickWKT plugin in QGIS, a command of the form POINT (30 10) draws a point at the desired location. However, how can I achieve to draw multiple points in one go? I am looking for something ...
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1answer
133 views

SQL WKT draws well with geometry, but not with geography data type

I have a following piece of code DECLARE @g geometry; DECLARE @borders geography; SET @g = geometry::STGeomFromText('SOME WKT', 0); SET @borders = GEOGRAPHY::STGeomFromText(@g.MakeValid()....
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78 views

How to obtain a WKT from a DotSpatial IFeature geometry?

I am using DotSpatial 1.9 and I have a feature (sourced from a shapefile). According to the docs, I should be able to call: ToString() on IFeature. // // Summary: // Returns the Well-...
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0answers
129 views

Storing Shapely polygons in MySQL

I have to store some polygons in a MySQL database. The polygons are in Plate Carrée (ESPG 32662) projection, but I also tried to first converting them to the usual latitude-longitude projection (ESPG ...
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1answer
47 views

GeoTools and GDAL: CRS WKT

I would like to achieve the same output as for GDAL using the GeoTools library: CoordinateReferenceSystem crs = CRS.decode("EPSG:32632"); String wkt = crs.toWKT(); System.out.println(wkt);...
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When does WKT orientation matter for polygon and multipolygon in geography spatial (left/right hand rule, counter-clockwise, clockwise)

I've decide to use sql server on Azure for my gis database. I'll be dealing with spatial Geography not Geometry. While inserting some country boundaries using the spatial data in SQL Server, some ...
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Get coordinates from web mercator projection to Lan & Lot (JavaScript/ node.js) [duplicate]

I have the WKT coordinates like below. LINESTRING (16139582.976129573 -4541142.959679384,16139974.715899538 -4540837.211566243) How can I get the Longitude and Latitude from that. I am using ...
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1answer
107 views

Converting coordinates in metres to Longitude & Latitude (CRS conversion) in OGC WKT format?

I have two tools that produce output in OGC WKT format. But they look different. Could you please explain this(I am very new to GIS). For my project I want the coordinates in the second format. Is ...
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1answer
59 views

How to create geom object from list of lat long coordinates

I have this geometry key that looks like this from which I want to create a Geom object so something like this MultiPolygon(((-xx.73833882299999 yy.41161324700006, -xx.73826573899998 yy.41172750400005....
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95 views

Athena: querying GeoJSON

Let's say I have a dataset with one column being GeoJSONs encoded as string. AWS Athena supports ESRI and hence geo queries on geometries: https://docs.aws.amazon.com/athena/latest/ug/geospatial-...
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1answer
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PyShp error: Object does not implement __geo_interface__

I'd like to convert geometry to WKT with pyshp and pygeoif using this suggestion, but pyshp throws a following error: Traceback (most recent call last): File "E:/!Projects/imScrape/...
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1answer
57 views

Converting CRS?

I am trying to convert an N-triple RDF file which has geometries with WKT which use EPSG/3857 and I need to convert all WKTs to EPSG/4326 (I think it is the same as WGS84). As a first step, I tried ...
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1answer
69 views

fromWKT - how to pull all info from source data?

I have a CSV storing addresses, reference numbers, etc... and also a WKT string of boundary coordinates for each property: The script (ammended from another user's post in 2012) sccessfully converts ...
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1answer
141 views

PyQGIS - How to import WKT string from a CSV to a polygon shapefile? [duplicate]

In QGIS, I can add WKT data stored in a CSV by clicking the 'Add Delimited Text Layer' tool and setting it to 'WKT'. This works fine: But how can I do it as a python script? Ideally I'd like a ...
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Getting information on geo file projection in Python?

I have many geo files with different extensions, from different sources (mid/mif, shape, geojson, dat). I'd like to get information on their projection (i've no access to epsg code). Maybe, I search ...
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2answers
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Plain geometry editor for QGIS 3.0?

In QGIS 2.18, I had been using the plugin "Plain Geometry Editor" to view, copy and paste the WKT geometry of features (as a solution to this question). However, this plugin is not available for QGIS ...
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1answer
399 views

is it possible to open a geotiff file in python without using gdal?

Trying to get gdal and whichever associated python bindings installed with the oldish OS my company uses is extremely painful, especially so in ci/cd and testing situations. I keep coming across ...
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EPSG WKT Rasterio

I have a question regarding the warping options in rasterio. I have two raster datasets from Albania. The first raster is the product of a clipping, and the second one is the country's boundaries. For ...
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1answer
81 views

WKT to shapefile using arcpy

I'm trying to convert WKT from an API to a shapefile via arcpy (there is a requirement to use the ArcGIS GUI) and am unable to get arcpy to create the shapefile. My code: def create_shapefile(self, ...
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87 views

What does wkt in GDAL intersection method do?

I don't think I understand WKT in the GDAL intersection method. When we use it are we suppose to change the numbers? from osgeo import ogr wkt1 = "POLYGON ((1208064.271243039 624154.6783778917, ...
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100 views

How to display CSV with WKT in ArcMap

I have been given a CSV which has a mixture of point and polygon data. I am trying to open this up in ArcMap 10.5.1 I have no idea what I should be doing! I have tried to look for answers online ...
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39 views

Reduce coordinate precision in MSSQL WKT

When you use the AsText() function on geometry objects in MSSQL Server 2008+ you get something like this: "LINESTRING (8.8446177236171337 47.721989356913951, 8.844617919281065 47.721977134398223, 8....
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1answer
268 views

Is MULTICURVE geometry in WKT valid according to the standard and open source community?

We are using Oracle function (SDO_UTIL.TO_WKTGEOMETRY) for exporting geometry to WKT. Some geometries have MULTICURVE in WKT, like this one: MULTICURVE (COMPOUNDCURVE (LINESTRING (3451418.006 5481808....
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1answer
138 views

Reduce geojson/wkt source data density

I have administrative boundary data in geojson/wkt format, which I retrieve from my REST service and display, using mapbox gl. This works well enough, but the data points are (depending on the country)...
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1answer
82 views

Polygons in CSV, WKT coordinate order

I have a text file with the data: 98923|Place1|31.144562;33.741344:31.171932;33.873543:31.103771;33.884808:31.073994;33.786865 342342|Place2|36.995064;7.632923:36.995880;7.849720:36.832218;7.848527:...
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5answers
620 views

Is there a way in QGIS 3 to get a selected feature WKT?

In QGIS 2.x, I used the getWkt plugin: https://github.com/hugoledoux/QGIS-getWKT to get a WKT of a selected feature. But that plugin isn't present in QGIS 3.x. Was that capability built into core ...
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1answer
270 views

Read a CSV with two Polygons(WKT) with GDAL

I am trying to read a CSV file where the geometries of neighbouring polygons are stored in couples. The file looks like this. I usually read shapefiles in GDAL using the following syntax ...
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1answer
157 views

arcpy FromWKT to functioning in_memory layer to be used in geoprocessing tools

As part of a larger script I am extracting postgis geometries from WKT(got that part down) then I am trying to create an in_memory polygon geometry to be used in arcpy tools. so far: ...
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1answer
592 views

Converting GeoJSON pixel coordinates to lat long coordinates for use with Google Maps API?

The entire process is quite a bit more complex than the question, so let me briefly describe it: An SVG overlay of map features is parsed. Each path is converted to WKT using SVG-to-WKT and then ...
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1answer
54 views

How do I get the location from an unidentified coordinate system point?

I'm working in C# and I have this JSON: {"id":429,"name":null,"address":"10 Wooleys La.", "city":"Great Neck", "decadeBlt":0,"totalUnits":12,"propertyType":null, "yea‌​rBlt":0,"expectedCom‌​pletion":...
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1answer
67 views

How to use old WKT(version1) coordinate reference system in ArcGIS Desktop?

I have a local coordinate reference system defined with WKT: COMPD_CS[ "test", FITTED_CS[ "", PARAM_MT[ ...
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2answers
452 views

gdalwarp cutline without using a shapefile

I'm currently working with gdalwarp to split some tiffs. gdalwarp -cutline file.shp -dstalpha -of GTiff image.tif split_image.tif I wanted to know if I can use an other source rather than use a ...
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1answer
177 views

st_astext generate an invalid wkt in postgis

The query: select st_astext(dn_geom), st_isvalid(dn_geom), st_area(dn_geom) from t$table Generates an incorrect WKT from a geometry apparently valid: POLYGON((-2.96954161967213 41.4400844183428,-...
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3answers
122 views

Listing coordinates of polygons in WKT format

I have a polygon shapefile made up of 2 shapes (independent of each other). I'm using the code below to print in the ArcMap python console, a list of each shapes coordinates in WKT format. I get an ...
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1answer
140 views

Understand way field (type geometry) in planet_osm_polygon

I'm new to QGIS and I'm using PostGreSQL and QGIS DB Manager to get information from the polygon_osm tables. I'm currently working on the _polygon table and I'd like to get the coordinates for each ...
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1answer
56 views

Convert WKT to Layer arcpy

I have a CSV file with number of records that have WKT Point geometry. I am bit lost on how to insert to this into a new point layer. Sample data from CSV file from GeometryItem Field: POINT (-...
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1answer
270 views

How to generate WKT geometries from true type font glyphs (python)

Does anyone know of a library or tool ( preferrably Python)to convert true type font glyphs into polygonal shapes (for testing GIS algorithms)?
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1answer
637 views

OpenLayers 4.2 - Changing the interaction geometry type from polygon to multipolygon

I would like to make a selection with DragBox interaction and get the geometry type to Multipolygon. Right now I'm getting a Polygon type back : var source = new ol.source.Vector({wrapX: false}); ...
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5answers
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WKT for EPSG:4326 with LON 0 to +360 instead of -180 to +180

I have GRIB2 files that seem to be in a projection similar to EPSG: 4326, except that instead of longitude between -180 and +180 it is between 0 and 360. My intention is to get these files into ...
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2answers
109 views

Creating two-colored map of region in one color, and neighbors in another color? [closed]

As they say, a picture is worth more than a thousand words: Turkey in Wikipedia What I need is to create maps for an educational system, and though we can create them manually in a lot of ...