Technically is an ordinal level measurement - because the options imply a hierarchy (i.e low to high levels of your variable of interest), but we cannot say that the difference between each level is precisely the same as you would be able to with an interval measurement. There is some controversy over this though, and it is still often used like an interval measurement in statistical tests, although this might not really be appropriate.
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It depends on the specific likert scale, but generally it is the ordinal level
It is a ratio scale of measurement.
Three basic levels of measurement are nominal, ordinal, and interval/interval-ratio.
It depends on the scale of the map, the range of values attained within the area of the map, the units of measurement and the accuracy of the contour data.
Absolutely. SPSS doesn't care how you collect data; it just analyzes that data that you input. Likert scale data is usually treated as continuous, although this practice is not without some controversy from more conservative researchers.