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Timestamp Message
20 Jan 2020
02:36:29@freenode_darkblue_b:matrix.orgdarkblue_b we didnt include a "scale factor" that I can recall
02:38:04@freenode_phma:matrix.orgphmawe compute two scale factors, one from ground to ellipsoid (depends on elevation) and one from ellipsoid to plane, and multiply them
02:38:08@freenode_darkblue_b:matrix.orgdarkblue_bthis is the other def, and I admit I dont know all the parts of this one.. https://spatialreference.org/ref/epsg/nad83-california-albers/ogcwkt/
02:39:56@freenode_phma:matrix.orgphmaConic equal-area.
02:41:19@freenode_phma:matrix.orgphma All state plane grids in the USA are either transverse Mercator or conformal conic, except in Alaska where there's an oblique Mercator. None are equal-area.
02:41:35@freenode_darkblue_b:matrix.orgdarkblue_b.. so the area (in meters) of a high school in N California, is somewhat similar to the area (in meters) of a high school in Southern California, I suppose
02:41:48@freenode_phma:matrix.orgphmasquare meters
02:42:04@freenode_darkblue_b:matrix.orgdarkblue_bI am not going to think about Alaska right now :-) yes, m-2
02:42:29@freenode_darkblue_b:matrix.orgdarkblue_bcontinental US is ok for me at the moment
02:42:43@freenode_phma:matrix.orgphmathe scale factor should be within 10^-4 of 1 everywhere in the zone
02:43:16@freenode_phma:matrix.orgphmaof course, if you use NC grid in Maine, the scale factor will be seriously off
02:43:34@freenode_phma:matrix.orgphmaor if you use Georgia grid in California
02:43:46@freenode_darkblue_b:matrix.orgdarkblue_bmy family is from Maine, maybe you didnt know it..
02:43:57@freenode_darkblue_b:matrix.orgdarkblue_b280 years there :-)
02:44:22@freenode_phma:matrix.orgphmaThe main thing is to keep the Maine thing the main thing!
02:44:22@freenode_darkblue_b:matrix.orgdarkblue_b it was "Massachusettes"
02:45:10@freenode_darkblue_b:matrix.orgdarkblue_bwelcome to jolly old Boston, the Land of the Bean and the Cod, where Lowells speak only to Cabots, and Cabots speak only to God
02:54:25@freenode_phma:matrix.orgphma Why don't Cabots speak to Lowells?
02:55:21@freenode_darkblue_b:matrix.orgdarkblue_btoo pious, apparently
02:55:30@freenode_darkblue_b:matrix.orgdarkblue_bprobably shy really
02:58:31@freenode_phma:matrix.orgphma anyway, I need to download some points from a survey, and make a smoothie, and take a shower, and leave two faucets dripping because it'll get down to -6 tonight
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