Postholer - Hiking & GIS
@postholer.com
GIS, Interactive & Printed Trail Maps, Data Books, Trip Planners, Snow, Wildfires, Gear Lists, Open Source, GDAL Evangelist. https://www.postholer.com, https://cloudnativemaps.com, https://femafhz.com
Here's an interactive map with the same data. Double-click anywhere to get the annual precipitation for an exact location:
www.femafhz.com/map/48.62379...
www.femafhz.com/map/48.62379...
November 12, 2025 at 5:37 PM
Here's an interactive map with the same data. Double-click anywhere to get the annual precipitation for an exact location:
www.femafhz.com/map/48.62379...
www.femafhz.com/map/48.62379...
Negotiate === concede
November 10, 2025 at 9:14 PM
Negotiate === concede
Nothing is more traditional than python?
Python spatial and all its package baggage are built on top of GDAL. Cut out the middleman and use 'gdal ....' to create/edit ALL your raster/vector data directly.
(Looking at you, too, ESRI)
Python spatial and all its package baggage are built on top of GDAL. Cut out the middleman and use 'gdal ....' to create/edit ALL your raster/vector data directly.
(Looking at you, too, ESRI)
November 10, 2025 at 5:37 PM
Nothing is more traditional than python?
Python spatial and all its package baggage are built on top of GDAL. Cut out the middleman and use 'gdal ....' to create/edit ALL your raster/vector data directly.
(Looking at you, too, ESRI)
Python spatial and all its package baggage are built on top of GDAL. Cut out the middleman and use 'gdal ....' to create/edit ALL your raster/vector data directly.
(Looking at you, too, ESRI)
"the dog catching the car"
November 4, 2025 at 6:13 PM
"the dog catching the car"
Seems like the guy from AWS last week found new employment.
October 29, 2025 at 6:11 PM
Seems like the guy from AWS last week found new employment.
Geosynchronous-LEO. Cool! ;)
October 29, 2025 at 5:44 PM
Geosynchronous-LEO. Cool! ;)
Here's a National Risk Index map for those disasters, except interactive, at state, county, census tract level for 24 different categories and 20+ metrics, percentile, expected annual loss, etc ,etc. 2022 data.
Riverine Flooding shown:
www.femafhz.com/map/36.98500...
Riverine Flooding shown:
www.femafhz.com/map/36.98500...
October 27, 2025 at 3:48 PM
Here's a National Risk Index map for those disasters, except interactive, at state, county, census tract level for 24 different categories and 20+ metrics, percentile, expected annual loss, etc ,etc. 2022 data.
Riverine Flooding shown:
www.femafhz.com/map/36.98500...
Riverine Flooding shown:
www.femafhz.com/map/36.98500...
Fully interactive map of #Melissa, with the most up-to-date NHC data:
www.femafhz.com/map/19.43551...
www.femafhz.com/map/19.43551...
October 27, 2025 at 3:34 PM
Fully interactive map of #Melissa, with the most up-to-date NHC data:
www.femafhz.com/map/19.43551...
www.femafhz.com/map/19.43551...
Here's the same result using only #GDAL, cutting out the python nastiness:
Simplify:
gdal vector simplify --input=states.gpkg --tolerance=.5 --output=simple.gpkg
Clean coverage:
gdal vector clean-coverage --input=simple.gpkg --snapping-distance=.7 --output=clleaned.gpkg
Simplify:
gdal vector simplify --input=states.gpkg --tolerance=.5 --output=simple.gpkg
Clean coverage:
gdal vector clean-coverage --input=simple.gpkg --snapping-distance=.7 --output=clleaned.gpkg
October 26, 2025 at 5:46 PM
Here's the same result using only #GDAL, cutting out the python nastiness:
Simplify:
gdal vector simplify --input=states.gpkg --tolerance=.5 --output=simple.gpkg
Clean coverage:
gdal vector clean-coverage --input=simple.gpkg --snapping-distance=.7 --output=clleaned.gpkg
Simplify:
gdal vector simplify --input=states.gpkg --tolerance=.5 --output=simple.gpkg
Clean coverage:
gdal vector clean-coverage --input=simple.gpkg --snapping-distance=.7 --output=clleaned.gpkg
#Melissa Cat 2-4, Sun 8am to Tues 8am, with Jamaica on the right hand side of the storm, 50km away. Brutal.
www.femafhz.com/map/17.66233...
www.femafhz.com/map/17.66233...
October 23, 2025 at 4:34 PM
#Melissa Cat 2-4, Sun 8am to Tues 8am, with Jamaica on the right hand side of the storm, 50km away. Brutal.
www.femafhz.com/map/17.66233...
www.femafhz.com/map/17.66233...
kdp.amazon.com
On demand printing, no limit on # of copies. Print or eBook. Guidelines exist that can make it daunting. Not a small task. I've been using KDP for 10+ years:
www.postholer.com/maps/Pacific...
On demand printing, no limit on # of copies. Print or eBook. Guidelines exist that can make it daunting. Not a small task. I've been using KDP for 10+ years:
www.postholer.com/maps/Pacific...
October 21, 2025 at 4:41 PM
kdp.amazon.com
On demand printing, no limit on # of copies. Print or eBook. Guidelines exist that can make it daunting. Not a small task. I've been using KDP for 10+ years:
www.postholer.com/maps/Pacific...
On demand printing, no limit on # of copies. Print or eBook. Guidelines exist that can make it daunting. Not a small task. I've been using KDP for 10+ years:
www.postholer.com/maps/Pacific...
Not true. How much data will you fetch from an internet web-server?
The network and the client's ability to process is the limitation, NOT the FGB/COG format. How is shoving 50MB of vector data into an app/browser over the internet useful?
Parquet tooling is a problem, not a solution.
The network and the client's ability to process is the limitation, NOT the FGB/COG format. How is shoving 50MB of vector data into an app/browser over the internet useful?
Parquet tooling is a problem, not a solution.
October 16, 2025 at 11:26 PM
Not true. How much data will you fetch from an internet web-server?
The network and the client's ability to process is the limitation, NOT the FGB/COG format. How is shoving 50MB of vector data into an app/browser over the internet useful?
Parquet tooling is a problem, not a solution.
The network and the client's ability to process is the limitation, NOT the FGB/COG format. How is shoving 50MB of vector data into an app/browser over the internet useful?
Parquet tooling is a problem, not a solution.
Why bother with Sedona/spark/duckdb/arrow overhead, if you're doing bbox range requests?
People need to understand, for bbox spatial queries, web server range requests and the proper file format, FGB/COG, are ideal.
Need a non-spatial attribute query? Great! Use the overhead you're suggesting.
People need to understand, for bbox spatial queries, web server range requests and the proper file format, FGB/COG, are ideal.
Need a non-spatial attribute query? Great! Use the overhead you're suggesting.
October 16, 2025 at 10:32 PM
Why bother with Sedona/spark/duckdb/arrow overhead, if you're doing bbox range requests?
People need to understand, for bbox spatial queries, web server range requests and the proper file format, FGB/COG, are ideal.
Need a non-spatial attribute query? Great! Use the overhead you're suggesting.
People need to understand, for bbox spatial queries, web server range requests and the proper file format, FGB/COG, are ideal.
Need a non-spatial attribute query? Great! Use the overhead you're suggesting.
"GeoParquet file plonked on a web server" is disingenuous. Only Spark/SedonaDB query by polygon/attribute, requiring HDFS.
Examples DuckDB, GeoPandas, GDAL all use bbox. With FGB you don't need any of that. Overture 145M buildings, single 35GB FGB remote web server:
www.femafhz.com/map/26.90634...
Examples DuckDB, GeoPandas, GDAL all use bbox. With FGB you don't need any of that. Overture 145M buildings, single 35GB FGB remote web server:
www.femafhz.com/map/26.90634...
October 16, 2025 at 4:54 PM
"GeoParquet file plonked on a web server" is disingenuous. Only Spark/SedonaDB query by polygon/attribute, requiring HDFS.
Examples DuckDB, GeoPandas, GDAL all use bbox. With FGB you don't need any of that. Overture 145M buildings, single 35GB FGB remote web server:
www.femafhz.com/map/26.90634...
Examples DuckDB, GeoPandas, GDAL all use bbox. With FGB you don't need any of that. Overture 145M buildings, single 35GB FGB remote web server:
www.femafhz.com/map/26.90634...
“If you don’t want it crawled, don’t put it online.”
...or dynamically put the IP in iptables.
...or dynamically put the IP in iptables.
October 14, 2025 at 5:16 PM
“If you don’t want it crawled, don’t put it online.”
...or dynamically put the IP in iptables.
...or dynamically put the IP in iptables.
October 13, 2025 at 4:26 PM
According to Bureau of Reclamation, Powell has a 10% chance of 'minimum power pool' for 2027/28/30. 3% chance for 2029.
Mead has 7% chance for 2029, 3% for 2030, otherwise 0%.
www.usbr.gov/lc/region/g4...
Mead has 7% chance for 2029, 3% for 2030, otherwise 0%.
www.usbr.gov/lc/region/g4...
October 9, 2025 at 1:20 AM
According to Bureau of Reclamation, Powell has a 10% chance of 'minimum power pool' for 2027/28/30. 3% chance for 2029.
Mead has 7% chance for 2029, 3% for 2030, otherwise 0%.
www.usbr.gov/lc/region/g4...
Mead has 7% chance for 2029, 3% for 2030, otherwise 0%.
www.usbr.gov/lc/region/g4...