Output files from the GEODAS Coastlines Extractor are saved to your disk as ASCII files. These files contain data from the current plotted GEODAS Coastline at the current resolution, from the selected area on your plot. At this time there are 2 choices for output format.
This format is the ASCII Version of the GEODAS 2-D Vector Format VCT00. A brief breakdown of the format follows. See GEODAS 2-D Vector Format for a full description of this format.
ASCII VCT00 files are simply a series of records, broken up into line segments according to the pencode, which contains the resolution information as multiplication factors of one or more of the first 7 prime numbers, the value of which increases with lower Resolution. In this way a single pencode can be used for several different resolutions.
The data records are 28 ASCII characters in fixed fields, plus computer's end-of-record indicator. There will always be at least one space between fields, allowing the data to be input as space-delimited data.
FIELD NAME SIZE DESCRIPTION
________________________________________________________
Longitude 11 Longitude of the point, with precision up to 6 decimals.
Latitude 11 Latitude of the point, with precision up to 6 decimals.
Pencode 6 Delineates the flow of the segments:
0 - Start, MoveTo Point (Pen up Move)
1 - Full Res, LineTo Point (Pen Down Move)
Factor of 2 - Second Level Resolution LineTo Pt
Factor of 3 - Third Level Resolution LineTo Pt
Factor of 5 - Fourth Level Resolution LineTo Pt
etc.
Example
-102.670000 -74.580000 1
-101.330000 -74.750000 10
-100.000000 -75.000000 3
-99.500000 -74.750000 770
-101.330000 -74.330000 30
-100.670000 -74.000000 30
-101.500000 -73.750000 6
-101.500000 -73.500000 385
-100.000000 -73.580000 30030
This format can be imported by a number of GIS applications, such as Arc/Info and Arc/View. It consists of ASCII formatted records, each containing a line-segment number, followed by a series of comma-separated longitude/latitude records for that segment,, followed by the ASCII line "END". Segments are repeated in this manner. After the last segment with it's "END" line, an additional "END" line is output. The GEODAS version of this format follows:
Character Field
Nos. Length Description
____________________________________________________________
1-11 11 Longitude of the point, with precision to 6 decimals
decimal points are explicit
+ = East, - = West
12 1 Comma separator
13-22 10 Latitude of the point, precision to 6 decimals
Decimal points are explicit
+ = North, - = South
Example:
1
100.351130, 5.977480
100.343630, 5.999980
END
2
99.336110, 6.488890
99.340280, 6.488890
99.336110, 6.488890
END
3
99.465280, 6.566390
99.469440, 6.569170
99.465280, 6.566390
END
...
220
99.368610, 7.223050
99.380840, 7.206110
99.390560, 7.204440
99.397780, 7.210000
99.396120, 7.222220
END
END