K.4.2 The low resolution (-Dl)
Keywords: GMT_Docs

Next: K.4.3 The intermediate resolution Up: K.4 The Five Resolutions Previous: K.4.1 The crude resolution Contents Index

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K.4.2 The low resolution (-Dl)

We have now reduced the map area by zooming in on the map center. Now, the edges of the map are all 2000 km true distance from the projection center. At this scale we choose the low resolution data that faithfully reproduce the dominant geographic features in the region. We cut back on minor features less than 100 km in area. We still add national borders to the plot. The low database is less decimated and simplified by the DP-routine: The total file size of the coastlines, rivers, and borders combined grows to 876 Kbytes; it is the default resolution in GMT. The plot is generated by the command:

    pscoast `./getbox.sh -JE130.35/-0.2/1i -2000 2000 -2000 2000` -JE130.35/-0.2/3.5i -P -Dl -A100 \
       -Glightgray -Wthinnest -N1/thinnest,- -B10g5WSne -K > GMT_App_K_2.ps
    ./getrect.sh -JE130.35/-0.2/1i -500 500 -500 500 | psxy -R -JE130.35/-0.2/3.5i -O -Wthicker -L -A \
       >> GMT_App_K_2.ps

Figure K.2: Map using the low resolution coastline data.

Next: K.4.3 The intermediate resolution Up: K.4 The Five Resolutions Previous: K.4.1 The crude resolution Contents Index