Graphics Reference
In-Depth Information
Figure
.
.
Finding water regions. he contrast due to density differences around low values of B
is
the visual cue that prompts this query
Figure
.
.
(Let)helake(theresultofthequeryshowninFig.
.
)and(right) just its boundary
(the result of the query shown in Fig.
.
)
Follow up on anything that catches the eye: gaps, regularities, holes, twists, peaks
andvalleys, density contrasts (like the one at lowvalues of B
throughB
).Using the
Interval query, activated by the
I
button, starting at the minimum, we grab the low
range of B
(between the arrowheads), stopping at the dense part as shown in Fig.
.
. he result, shown on the let of Fig.
.
, is amazing. We have found the water -
the lake is clearly visible, together with two other regions which turn out to be small
streams upon comparing with the map. With our scrutiny rewarded, we recall the
adage that
a good thing may be worth repeating.
Searching for density variations within the lower interval of B
, we note that the
lowest part is much denser than the rest. Experimenting a bit, and appreciating the
