Blog

I write about GPXZ as well as elevation data in general. Get notified about new posts with RSS.

DEM void filling algorithms 2024-06-13
Precicely cropping a raster in rasterio 2024-06-05
Coastal artefacts in the Mapzen DEM 2024-05-14
Cropping and reprojecting a UTM raster to latlon 2024-04-23
Unravelling a raster to a pandas dataframe 2024-04-23
Managing API keys in django 2024-03-10
EUDEM download 2024-01-20
Raster API 2023-12-05
Which open elevation dataset should I use? 2023-11-28
RAID disk monitoring with postfix and mailgun 2023-11-01
Upcoming GPXZ dataset update 2023-10-05
Migrating from Open Topo Data 2023-07-06
Python task queue latency 2023-06-16
How to configure ruff 2023-05-31
Hong Kong elevation data guide 2023-05-25
Iceland 10m DTM quality 2023-04-05
GPXZ is a long-term business 2023-03-02
Japan elevation data guide 2022-02-03
Converting Japan DEM GML/XML files to geotiffs 2021-11-15
LERC compression benchmarks 2021-11-09
How LERC raster compression works 2021-11-03
PSA: Gratiot County 1m DEMs are in ft, not m 2021-10-29
Elevation accuracy of .gpx files 2021-10-27
Elevation data for exercise tracking apps 2021-10-20
Calculating elevation-adjusted calorie burn in Python 2021-10-13
Adding elevation to a .gpx file 2021-10-07
Loading a .gpx file into a Pandas DataFrame 2021-09-30
Fixing sparse .xyz files 2021-09-05
Sampling points along a lat,lon path 2021-09-04
lat lon lat lon lat lon 2021-08-06
Sampling geotiffs with zarr and tifffile 2021-07-16
Testing hack necessity 2021-07-06
Using rayshader in Python 2021-05-06
What causes differences between DEMs? 2021-05-03
Downloading the Copernicus DEMs 2021-03-29
Downloading USGS US DEMs 2021-03-29
Aligning rasters for inspection 2021-03-07
Aligning rasters for analysis 2021-03-03
Raster analysis workflow in numpy 2021-03-02
Paper: Fusing DEMs 2021-02-20
My notes from reading Nuth, C., & Kääb, A. (2011). 2021-02-20
Dashboard design 2021-02-19
Learning django 2021-02-17
My notes from reading 'The earth isn't flat'. 2021-02-12
My notes from reading 'Free and low cost datasets for international mountain cartography'. 2021-02-12
My notes from reading 'An evaluation of void filling interpolation methods for SRTM data'. 2021-02-09
Licenses used by elevation datasets. 2021-02-07
Taking responsibility for the GPXZ dataset. 2021-02-05
Using non-uniformity to tile a large elevation dataset. 2021-02-03
Alternative #2: Mapzen 2021-02-02
Alternative #1: SRTM. 2021-02-02
An idea 2021-02-01