Credit the foundation
Keep authorship, source reports, datums, versions, and processing history attached to every result.
Geology · GIS · collaborative mapping
Good maps should outlive the project that made them.
Logic Cloud Geo connects published geoscience, transparent web services, and reproducible workflows so geologists can preserve what is known—and make the next interpretation better.
- Source-aware
- Methods visible
- Built to collaborate
A framework larger than a borderThe premise
Preserve the lineage. Make the logic usable.
Regional frameworks, local refinements, boreholes, rasters, and changing nomenclature all carry part of the story. LCG is a place to keep those relationships explicit instead of flattening them into one final map.
Work across scales
Let a project-specific framework refine a regional one without erasing either interpretation.
Share the method
Pair services with documented APIs, notebooks, and visible assumptions that other geoscientists can examine and extend.
Articles & papers
Put published science back to work.
Methods and working examples by Lester J. Williams: preserve the sources, explain the calculations, and make published science usable.
Estimating formation-water salinity from geophysical logs
The resistivity–porosity method, explicit assumptions, and a worked GGS3114 Sedgwick well example from Thomas County, Georgia.
Giving published geoscience a working future
How a master workbook, Python automation, and scientific review brought DS926 into a reusable publication workflow - and how the process can serve another agency's reports.
Floridan aquifer system subsurface elevation retrieval
The methods behind estimated aquifer elevations and depths: source grids, framework relationships, geographic applicability, and reusable notebooks.
Working public service
LiveTerrain elevations for mapping and topographic profiles
Submit one WGS 84 point, an ordered batch, or a line profile. The service returns USGS 3DEP bare-earth elevations with units and source metadata suitable for maps, notebooks, and GIS workflows.
- Input
- WGS 84 latitude / longitude
- Queries
- Point · batch · profile
- Source
- USGS 3DEP bare-earth DEM
- Clients
- Web · Python · Jupyter · GIS
Floridan aquifer system · regional framework
Explore subsurface elevations at a point
Click a map or enter latitude and longitude to review estimated hydrogeologic surface elevations, depths, and salinity reference interpretations from USGS PP1807 / DS926.
- Input
- WGS 84 latitude / longitude
- Grid
- 30-m terrain; native geological grids
- Elevation
- U.S. survey feet · NAVD88
- Context
- Framework branch and qualifiers
A regional map you can query
Freshwater/Saltwater Interface Estimator
Explore the mapped 10,000 mg/L TDS surface in Florida and the surrounding Floridan aquifer system. Click for an estimated elevation and depth, or a fresh-to-base interpretation.
How it works and open the map →- Access
- Public ArcGIS Online map
- Grid
- 1,000-meter regional estimates
- Methods
- Three raster bands and an Arcade popup
Published foundations
The USGS regional hydrogeologic framework for the Floridan aquifer system is used here to demonstrate the principle behind LCG: reference and examine earlier work, revise it with new evidence, and publish the data needed for the next investigation.
LCG's initial project to demonstrate this process builds on USGS Professional Paper 1807 and its associated digital assets to create subsurface-elevation web services that make the data more readily available through web and computing applications.
For more information about this report and its datasets, see the links below.
USGS Professional Paper 1807
Revised hydrogeologic framework of the Floridan aquifer system
Lester J. Williams and Eve L. Kuniansky
Open publication USGS Data Series 926Digital surfaces and thicknesses of selected hydrogeologic units
Lester J. Williams and Joann F. Dixon
Open data release USGS Data Series 760Digital borehole geophysical log database
Source logs supporting regional interpretation and correlation
Open log databaseAbout the founder
Lester J. Williams
LCG Mapper In Chief
Join me and become an LCG mapper - let's learn together.
A professional geologist, groundwater hydrologist, and Python developer with more than 30 years of experience in regional hydrogeologic framework mapping, borehole geophysics, groundwater investigations, and applied GIS.
Logic Cloud Geo is a personal, independent effort to make scientific data easier to use and to reconnect with geologists, hydrogeologists, and developers who believe mapping improves when knowledge crosses institutional and geographic boundaries.
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