#topographic — Public Fediverse posts

Worth noting for #GoogleMaps users... It has been clear to me for some time that #Google is using machine learning algorithms (sometimes called "AI") to adjust boundaries of geographic features. I assume they run an #ML model over satellite photos to do this. Here's a example of it failing, badly. The first picture attached is a Google Map of an urban creek in my town, with a street just north of it. Note how Google shows the creek not going anywhere near the street. The second picture is a topographic map of the same area. Notice how the creek ACTUALLY goes much farther north than Google depicts. For creeks and bodies of water I've noticed this most often happens where there is an adjacent #FloodPlain that the creek spills into on occasion. Clearly Google's algorithm is noticing water during flood conditions, or breaks in the tree line, and "learning" that the creek has moved. (In their defense, it is quite unusual that this urban creek passes directly under an office building parking deck, which probably also played a part. But why use ML to do this stuff when #topographic data exists?) #AIFails #AIFailures

USGS topoBuilder Milestone of 1 Million Maps Delivered
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https://www.usgs.gov/programs/national-geospatial-program/topobuilder <-- USGS topoBuilder Open Source / Open Data creation page, make your own custom USGS ‘topo map’!
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“Each year, [the #USGS has] seen steady growth in map requests, underscoring the public’s trust and appreciation for these innovative products.
This [USGS topoBuilder Milestone of 1 Million Maps Delivered] is a testament to the dedication and expertise of colleagues across the National Geospatial Program and the National Geospatial Technical Operations Center. The success of topoBuilder is built on the collective efforts behind The National Map...
[The USGS] has modernized and advanced #topographic mapping…”
#GIS #spatial #mapping #NGP #NGTOC #usecase #fedscience #fedservive #topomap #ondemand #custom #USGS #topobuilder #opendata #publicservice #publicgood #milestone #TNM #NationalMap #free #recreation #usecase #agriculture #hiking
@USGS

USGS 3DEP LiDAR Collection @ Microsoft
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https://planetarycomputer.microsoft.com/dataset/group/3dep-LiDAR <-- Microsoft data / use case portal
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“To respond to growing needs for high-quality elevation data, the goal of 3DEP is to complete acquisition of nationwide lidar (IfSAR in AK) to provide the first-ever national baseline of consistent high-resolution topographic elevation data – both bare earth and 3D point clouds. This dataset provides the raw 3D point clouds in the Cloud Optimized Point Cloud format, and various derived products as Cloud Optimized GeoTIFFs…”
#GIS #spatial #mapping #gischat #3dep #elevation #opendata #planetarycomputer #LiDAR #ifsar #USA #nationwide #acquistion #topography #topographic #dem #bareearth #pointclouds #cloudoptimization #geotiffs #download #library #usgs #microsoft
@microsoft @usgs

Instructional Videos on Using [USGS’s] The National Map [Open Data] Products and Services [3DEP Elevation, Hydrology, etc]
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https://www.usgs.gov/programs/national-geospatial-program/training <-- shared technical training resource
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https://www.usgs.gov/programs/national-geospatial-program/national-map <-- background to the USGS’s Accessible National Map Open Data
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#GIS #spatial #mapping #USGS #opendata #elevation #hydrography #hydrology #NGTOC #NGP #3DEP #3DHP #topoBuilder #USA #gischat #TNM #TheNationalMap #products #services #dataportal #tutorials #tutorial #trainingvideos #videos #learning #continuingeducation #education #educationandtraining #free #videolessons #videolearning #topographic #topographicmaps #instructional #onlineclasses #onlineeducation #onlinelearning
@usgs

3D Nation Study Hub Site Now Available! [NOAA + USGS]
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https://nauticalcharts.noaa.gov/updates/3d-nation-study-hub-site-now-available/ <-- NOAA technical article / ‘press release’
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https://iocm.noaa.gov/planning/3DNationStudy.html <-- NOAA 3D Nation Elevation Requirements and Benefits Study
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#GIS #spatial #mapping #elevation #opendata #bathymetry #webportal #data #businesscase #offshore #benefits #benefitsstudy #3D #data #terrestrial #marine #offshore #hydrospatial #usecase #national #USA #datasets #datacollection #planning #3DNation #3DTNM #3DEP #topobathy #topographic #bathymetric #coast #coastal #businessuse #maps #CoNED #gischat #NOAA #USGS
@NOAA @USGS

NOAA Digital Coast - Coastal Elevation Data [open data access, USA]
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https://coast.noaa.gov/dataviewer/?#/lidar/search/ <-- link to open data portal
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https://www.usgs.gov/special-topics/coastal-national-elevation-database-applications-project/data <-- USGS Coastal National Elevation Database Applications (CoNED) Project Viewer
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“This repository contains U.S. topographic data gathered by many groups using a variety of lidar sensors. Using the custom download for up to 1.5 billion points, users may search and select output by year, area, data provider, elevation product, projection, datum, and format. Output types include point clouds, digital elevation models, and contours. Requests are submitted to an automated system for custom processing, and a URL link is emailed to the user upon completion…”
#GIS #spatial #mapping #usa #opendata #CoNED #DigitalCoast #elevation #topobathy #bathmetry #LiDAR #remotesensing #dataportal #digital #data #topographic #download #freedata #DEM #pointcloud #spatialanalysis #coast #coastal #SLR #sealevelrise
#NOAA #USGS

Quality Assessment Of DEM Derived From Topographic Maps For Geomorphometric Purposes
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https://doi.org/10.1515/geo-2019-0066 <-- shared paper
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#GIS #spatial #mapping #DEM #LiDAR #qualityassessment #geomorphometry #SilesianUpland #topographic #remotesensing #geomorphology #geomorphometry #hypsometry #quantative #landsurface #hillshade #slope #QAQC #landform #drainage #hydrology #water #quality #digital