The tag has no usage guidance.

learn more… | top users | synonyms

2
votes
0answers
11 views

Vanilla PHP and GeoTIFF: How to know byte address and byte length of a “strip” in an LZW-compressed GeoTiff?

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 ...
4
votes
2answers
204 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 ...
1
vote
0answers
111 views

Format of raw LiDAR data (ToF 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,z coordinates ...
2
votes
1answer
103 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 ...
6
votes
3answers
1k 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
vote
0answers
15 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
votes
1answer
16 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 ...
8
votes
3answers
353 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 ...
-1
votes
1answer
138 views

Can a shapefile store several geometry types? [duplicate]

Can a shapefile store several geometry types? Yes or no? Why or why not?
2
votes
3answers
167 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 ...
1
vote
3answers
86 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
vote
1answer
2k 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
votes
3answers
555 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 ...
3
votes
2answers
416 views

Looking for qml specification

Where I can find qml specification which is used for store symbology information in QGIS? Try to googe it - no result.
13
votes
2answers
3k 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
votes
3answers
211 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 ...
7
votes
1answer
3k 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 ...