nst-guide/naip

Generate high-resolution tiled imagery from USDA NAIP data

naip's Issues

Webp not full resolution through Mapbox GL JS?

Here's mount adams, at zoom 15, with webp's served over the internet (through Leaflet),

Here's at zoom 15.2 through maputnik:

And zoomed in even further:

Note that this project is superseded by naip-lambda

AWS NAIP open data

May be useful to check out AWS's NAIP imagery. https://registry.opendata.aws/naip/

You'd want the naip-visualization dataset (arn:aws:s3:::naip-visualization)

The data in this bucket is 3 band RGB in Geotiff format. It is converted and managed by Esri. This imagery is provided as Cloud Optimized GeoTIFFs, has been compressed using YCbCr JPEG with quality 85. It is provided as 512x512 tiles, with pyramids created using 2x sampling by averaging. The bucket is set as a Requester Pays bucket.

Transparent parts of tiled imagery

In some places, e.g. the San Gabriel mountains, there's an ugly green:

It's clear when you look with no background, that these are parts of the imagery that are transparent:

This is because I'm currently doing

gdalbuildvrt -srcnodata 0 data/naip.vrt data/raw/*.jp2

This makes all image pixels with 0,0,0[,0?] set as nodata, which makes them transparent when rendered. The issue is that there are some places in the original imagery that are so heavily shaded that they actually have pure-black values. For example, this is the original image with correct colors: