Created by Keven Bennett at ONRC
GIS
This tool is designed to extract and import all thematic data from multiple quads of 24k DLG SDTS data into Arc/INFO format. This tool uses public domain software (sdts2cov.aml) provided by USGS to ensure attribute accuracy for individual quads. It also creates an INFO item (append_data) in the FATs of each coverage to ensure lineage traceability of each feature in all coverages after an append operation back to its source, but it is up to the user to populate the first 5 digits with a unique identifier for each quad.
The Multiple Quad Extraction and Import Tool is supplied as
24kdlgp1.tar.gz. Please see download and extract instructions on the left of this page.
NT Arc/INFO users:
Winzip(R) cannot be run as a batch process (as far as I know), therefore, tar.exe, gunzip.exe, and gzip.exe need to be inserted into $path for the AMLs to execute properly. Please use these executables, as others may have problems with long filename handling, in which case, this tool will NOT work and MAY mangle your data!!
Unix Arc/INFO users:
Make sure to unalias any interactive options for rm, mv, cp, tar, gzip, and gunzip for the AMLs to execute properly. The Unix shell will NOT recognize 'unalias rm' etc. when passed by Arc/INFO from the command line!!
What this tool does:
This tool will extract ALL thematic data in 24k DLG SDTS format contained in
INTACT USGS ftp server directory structure.
How to use it:
To practice and to get a better idea of the output coverages, a sample dataset
consisting of 4 adjacent quads around Aberdeen and Hoquiam has been included separately as sample_data.tar. This archive contains aberdeen_WA, aberdeen_se_WA, hoquiam_WA and western_WA.
To process this data, untar sample_data.tar (for untarring, use the Winzip(R) instructions on the left of this page) and copy the contents of sample_data/ to data/and type '&r process' at the Arc: prompt. Just copy the data as it is on the server, put it in it's own directory and
run the tool. See readme_1st.txt and extract_import.hdr
first! It is easy to use, but it is also easy to make mistakes.
Important Data Details:
The output coverages will have built topology, where applicable. Each coverage in a given quad will be created under a workspace dated according to the SDTS 'Map Date' as given in the Arc SDTSINFO output for that coverage. This insures that historical data is also extracted, as there may be 2 or more datasets of the same theme with different 'map dates'.
All FATs of each coverage created will contain an item (append_data 4 10 b) in which the last 4 digits will be populated with values USGS uses for joining attribute data. To use this as a unique relate key across multiple quads, populate the first 5 digits with a unique quad identifier. This can be used to ensure traceabiltiy of all features back to their source should you need to append multiple quads together.
The following themes exist for USGS 24k DLG data, of which only a few, up to as many as all 15 may be found in a given quad:
| boundary |
pipe_translns |
| hydrography |
publss |
| hydroghyx (point coverage) |
railroads |
| hypsography |
roads_trails |
| hypsoghpx (point coverage) |
survey_contrl |
| manmade |
surveysmx (point coverage) |
| manmadmsx (point coverage) |
vegetation |
| nonveg_feat |
|
Many of the themes contain data extractable into numerous individual layers, particularly boundary, hydrography, manmade, and roads_trails. This tool does not extract individual layers from the themes.
For any questions contact Keven Bennett at kbenet@u.washington.edu.
