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Apr
27
comment Getting started with GeoJSON using Python
Even the name JSON has javascript in it. I am afraid I can't see any alternatives avoiding JS.
Apr
27
answered Drivers of Fiona
Apr
27
comment Automatic point plotting in ArcGIS from thresholded image
So you want an automatic method to trace a line along the path?
Apr
26
comment How to transform isolines to isopolygons with postgis?
ST_Split or ST_BuildArea are good candidates for your problem
Apr
25
comment Leveraging capabilities of PostGIS for large (ish) tables in PostgreSQL?
On a side note. 40 mil point is quite a dataset, which would help to test out postgis/postgres capabilities. Do you have any plans to make even a striped down version available?
Apr
25
comment Leveraging capabilities of PostGIS for large (ish) tables in PostgreSQL?
In your first query, what are updating ALL your points. Are you sure you want to do that or update just the point with no tract_geoid ?
Apr
25
comment Why do “stripes” appear on raster?
I have the feeling your source data were made by overlapping tiles. And you added the overlapping areas in the process.
Apr
24
comment PostGIS - syntax error inserting GeoJSON
Also note: ST_GeomFromGeoJSON works only for JSON Geometry fragments. It throws an error if you try to use it on a whole JSON document.
Apr
24
answered Longitude latitude for each pixel of Tiff Image
Apr
23
comment how to write first program in QGIS
According to the [qgis github site][1], the two main languages used in the project are c++ and python. So the first step would be to get familiar with these languages. [1]: github.com/qgis/QGIS
Apr
23
comment Are perpendicular lines still perpendicular after converting from UTM zone 15 to 16 (or between two neighboring zones)?
Looking back at one of your answers (gis.stackexchange.com/questions/31701/…) you demonstrated that the distortion can be acceptable even outside the boundaries.
Apr
22
comment Leveraging capabilities of PostGIS for large (ish) tables in PostgreSQL?
Not an answer, but quite relevant lwn.net/Articles/653411 . The link describes how newer versions of postgresql than yours gain tools to address 'mid-sized data' (1 to 10 terabyte)
Apr
22
comment PostGIS: floating point representation problem with ST_AsText
There are talks about that functionality for 2.3. github.com/postgis/postgis/pull/94
Apr
22
comment Convert a vector into a csv file
csv files are usually a means for data exchange between softwares and definitely not recommended for what what you are asking for.
Apr
22
revised Are perpendicular lines still perpendicular after converting from UTM zone 15 to 16 (or between two neighboring zones)?
edited tags
Apr
22
answered Are perpendicular lines still perpendicular after converting from UTM zone 15 to 16 (or between two neighboring zones)?
Apr
22
comment QGIS 2.14 save pdf with google maps
Regarding your comment 'the visible error is lost at a scale over 1/10000': The lowest width of a line that it's visible to a human eye is about 0.1mm, that for a scale 1:10000 that translates to a misplacement of 1m. Also in a case of a printed map take into consideration the 'half of pixel' rule. I would suggest to check with your specifications before deciding 'the error is lost'.
Apr
22
comment QGIS 2.14 save pdf with google maps
Openlayer seems to misbehaving when you stream it. As an alternative I can suggest you either save the image locally with the src properly defined in it, or use a proper WMS server. Ktimatologio WMS should cover you
Apr
22
comment QGIS 2.14 save pdf with google maps
it seems that the datum transformation parameters were not picked up. What's your project's Projection?
Apr
22
comment Comparing size between polygons in different UTM zones
What you are trying to do, is fundamentally wrong. It defeats the whole implementation of UTM system. If your points are outside your projection boundaries, that projection is not appropriate.