Questions tagged [specification]

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101 views

QGIS 3 how to customize line dash symbology

I want to keep the same line width but specify a much longer dash. The symbology controls in QGIS 3 have changed significantly from 2.X, so the many answers re: line symbology control for QGIS 2.X ...
4
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2answers
367 views

Is the erratum about polygon point order in GeoJSON correct?

The GeoJSON specification (RFC 7946) states that for polygons: A linear ring MUST follow the right-hand rule with respect to the area it bounds, i.e., exterior rings are counterclockwise, and holes ...
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1answer
733 views

ID for Feature in GeoJSON

The geotools library's GeoJSON plugin requires an ID to generate a Feature type. The specification of GeoJSON says it is a SHOULD and not a must. I'm trying to get rows from a database like SQL Server ...
10
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1answer
1k views

Is srsName of “EPSG:4326” spec compliant in GML 3.1 / 3.2?

I sometimes see srsName="EPSG:4326" in GML documents (e.g. https://postgis.net/docs/ST_GeomFromGML.html, although my particular source is not public). The intent (except perhaps for axis order that ...
2
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0answers
150 views

Meaning of Spatial resolution (m) = 2 rng?

I'm reading a catalog about SAR sensors. On page 17, it is said that: I've read the PolSAR data format for UAVSAR before, But not the other documentations related to InSAR, because I didn't ...
2
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0answers
87 views

Knowing byte address and byte length of “strip” in LZW-compressed GeoTiff with vanilla PHP?

I have a situation where I need to read cell values from a GeoTiff using vanilla PHP, and while I've been successful reading values from an uncompressed TIF (~800MB), I'm having difficulty reading ...
6
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2answers
623 views

What does it mean that shapefiles are “mostly” open specification?

Esri Shapefiles are commonly considered the standard format for GIS vector data. I noticed on Wikipedia and the OpenStreetMap wiki it is noted (emphasis mine): The shapefile format is a popular ...
2
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1answer
3k views

Format of raw LiDAR data (time-of-flight data)?

I am doing a project where I need to simulate LIDAR data, and I am looking for specifications on how raw LIDAR data looks. I want the format of the data before it is translated to x, y and z ...
2
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1answer
195 views

Which hardware for running FME 2015 on linux

I am running FME on Xubuntu. It works very fine save for some minor glitches with the inspector. I am planning on setting up a couple of rather heavy vector calculations (areaonarea,buffering and ...
21
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3answers
16k views

Order of polygon vertices in general GIS: clockwise or counterclockwise

Two days ago I asked a question about the internal storing order for the vertices of a polygon in ESRI shapefiles. That question was answered (Are polygons stored clockwise or counterclockwise in a ...
1
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0answers
22 views

Where can I find the format specification for LSLIFF data?

I have an LSLIFF file which should contain some map contour data, and I want to write a renderer for it, but to do that I need to understand the file format. A preliminary search has not turned up ...
0
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1answer
33 views

Guideline/scheme for naming properties in GeoJSON

Are there any guidelines/requirements for naming properties in GeoJSON? Should I add a vendor-prefix for my properties which only make in use with a specific application? I already read the ...
10
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3answers
2k views

Metadata and GeoJSON?

My agency currently maintains and distributes shapefiles with FGDC XML metadata. We have now converted a lot of shapes to GeoJSON but are concerned that if our developers forget where they got the ...
-2
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1answer
2k views

Can a shapefile store several geometry types? [duplicate]

Can a shapefile store several geometry types? Yes or no? Why or why not?
2
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3answers
359 views

What can I do with lidar returns of 6 or greater in LAS 1.2 specification?

I have lidar LAS data that contains a number of points that represent returns 6 or 7. The data is supposed to be in ASPRS LAS 1.2 specification, which does not allow return numbers (echos) greater ...
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3answers
161 views

Are there any resources or standards when writing a GIS data specification?

I have been searching for sources of GIS data specifications to assist with documenting a number of datasets that I'm currently working on. I'm used to looking at Ordnance Survey specifications, such ...
1
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1answer
5k views

DTED Level 3, 4 or 5

Does the specification for DTED 0 - 2 also apply to 3 - 5? I know the finest resolution supported by spec MIL-PRF-89020B is 0.1 arc-seconds which I think would barely cover up through DTED level 4, ...
4
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3answers
1k views

In an ESRI Shapefile, what is the “Record Number” field of each record header in the .shp file?

The shapefile specification (http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf) only says "Record numbers begin at 1." (page 5), which doesn't specify what the field actually is. As per page ...
4
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2answers
863 views

Looking for QML specification

Where I can find the QML specification which is used for storing symbology information in QGIS? I tried to Google it - but got no result.
16
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2answers
8k views

Recommended Server Specs for GeoServer

we serve our Geographic data via our flagship application Dorset Explorer. This uses OpenLayers and GeoServer to serve our Geographic data, including OSM and OS Basemaps and a mass of other data such ...
4
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3answers
388 views

Where can I find Specifications for Canadian National Topographic Map series?

At one time the Natural Resources Canada had the specifications for the National Topographic Series (NTS) maps online at http://www.nrcan.gc.ca/earth-sciences/cartospecs. It included things like the ...
12
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1answer
9k views

What's up with the GeoJSON spec and CRS as a IRM?

I'm writing a web API to our GIS data, currently revamping our geocoding service. I'm creating the option for folks to specify the output type as GeoJSON so I'm trying to follow the spec. Our data is ...