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timwaters / mapwarper

free open source public map georeferencer, georectifier and warper
http://mapwarper.net
MIT License
196 stars 80 forks source link

2 junk bands in exported geotiff #99

Closed mikelmaron closed 7 years ago

mikelmaron commented 7 years ago

Uploaded an image to mapwarper, and there are issues with the exported GeoTIFF.

we are uploading the resulting geotiff to mapbox studio. it need to upload a 3 (RGB) or 4 (RGBA) band geotiff w/ 8 bit pixels. the image displays fine in QGIS because when u add a raster of ⁠⁠⁠⁠n⁠⁠⁠⁠ bands, qgis takes the first three and displays them as rgb

temporary fix

so basically: bands 4 and 5 were junk. discarded them w/:

rio calc "(asarray (take a 1) (take a 2) (take a 3))" --co compress=lzw --co tiled=true --co blockxsize=256 --co blockysize=256 --name a=/Users/dnomadb/Downloads/15936.tif /tmp/hi.tif

then (to be sure) i set the nodata to 0:

rio edit-info --nodata 0 /tmp/hi.tif

fix

ideally mapwarper handles this problem automatically. i'm located the original image and will attach here for debugging

mikelmaron commented 7 years ago

Here's the original image https://drive.google.com/file/d/0BzqUHzqXPocbY3hpNm1vQVM4bW8/view

timwaters commented 7 years ago

This could be related to #80 and a fix may be in the wikimaps_new branch

gdalinfo NYC1776-mod.png Driver: PNG/Portable Network Graphics Files: NYC1776-mod.png Size is 1254, 966 Coordinate System is `' Metadata: Raw_profile_type_APP1= generic profile 34 49492a0008000000010031010200070000001a000000000000005069636173610000

Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( 0.0, 0.0) Lower Left ( 0.0, 966.0) Upper Right ( 1254.0, 0.0) Lower Right ( 1254.0, 966.0) Center ( 627.0, 483.0) Band 1 Block=1254x1 Type=Byte, ColorInterp=Red Mask Flags: PER_DATASET ALPHA Band 2 Block=1254x1 Type=Byte, ColorInterp=Green Mask Flags: PER_DATASET ALPHA Band 3 Block=1254x1 Type=Byte, ColorInterp=Blue Mask Flags: PER_DATASET ALPHA Band 4 Block=1254x1 Type=Byte, ColorInterp=Alpha

timwaters commented 7 years ago

this is fixed on master now, however there will be a lag for deployment to mapwarper.net

timwaters commented 7 years ago

closing because due to deploy