1.   It follows, therefore, that no map-related spatial data exist which are wholly error-free.

2.   The production of block diagrams and other representations of spatial data in graphical form is also part of automated cartography.

3.   First of all, more spatial data are becoming available in digital or computer-readable form.

4.   Thirdly, digital maps can be combined with other kinds of spatial data in a Geographical Information System.

5.   The techniques for displaying spatial data have been reviewed in previous chapters.

6.   One, as we have noted several times in this chapter, is the availability of spatial data in computer-readable format.

7.   More disaggregated spatial data is not yet available though earlier studies suggest that the range of disparity may well be of similar if not greater orders of magnitude.