Suzan,
ONE:
Because we don't know for sure if these structures are
houses, we just tag them as "Building." Something the size of a house
could be Siddharta's Car Repair, so we're safest with "Building."
TWO:
Could be a huge boulder, but, if it's rectangular, that's
unlikely. Most likely, if it's square or rectangular, it's a
building. Also, if you look for shadows along the edge, sometimes you
can see that it's about one story tall and has a straight roofline.
THREE
I doubt there are many triangular buildings. Yes, change those.
FOUR
Try to do the exact building shape. That makes it easier for
field teams to match actual buildings to the map. It can be a
challenge if the building has a couple of wings and a porch, but it is helpful.
FIVE
Yes, please add the individual buildings within the
"residential" polygon.
SIX
Most of the Bing images are not after the earthquake. Some
imagery is recent, notably that marked DigitalGlobe, but I'm not sure
if it is after the earthquake. Can anyone else answer this question?
Thanks for all your hard work.
Charlotte
At 04:39 PM 4/30/2015, you wrote:
ONE Small structures/houses
In remote areas, lightly populated, it's difficult to see if a small
structure is a house or something else. I am labeling them all
"house". Is this correct? People live in tiny places in Nepal, less
that 25' square. They are hard to discern. If it looks like a
building, I mark it as a house. Is this good?
TWO Geologic structures
It is difficult to tell geologic structures from houses in some
cases. I look to see if there are similar structures in the
landscape, if there are fields or agriculture, then mark it as a
house as I have been erring on the side of marking houses and having
people recognized as being there than not. I want everyone on the
map. This may mean I've made mistakes and it's a huge boulder with a
shadow. Comments?
THREE Changing others' work
Also, some of my colleagues have marked houses with triangles, not
rectangles. Can I correct these?
FOUR Exact building shape
Is the shape of the building important? It's often difficult to tell
if it's part of the house or an outbuilding or a shed near the
house. Knowing there are people living there seems more important,
but if the actual shape is important, I will go back and redo my work.
FIVE Residential vs. all houses marked
Many remote villages are simply marked with a polygon Residential
Area. Should I add the structures to these areas?
SIX Up-to-date BING images?
Also, how recent are the Bing images? In remote areas, much could
have been lost to landslides. I also come across areas with clouds.
I can go back and map these if the images are refreshed.
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