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#landform

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💧🌏 Greg Cocks

Fluvial System Block Diagrams
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I was looking to understand a fluvial system the other day, up in the high Arctic, as I looked at 3DEP remote sensed elevation data… I have always been fascinated by the how geology, water, weather shapes a landscape, including erosion (aka geomorphology if you will) – and realized how very much value fluvial block diagrams have as we try to conceptualise what has, is and will happen(ed.)

Public
Jean-Baptiste Née

Mont analogue (XVII)
encre de Chine et méthylcellulose sur toile, 140 x 200 cm, Suisse, octobre 2024.

🇬🇧
[Analogous Mount (XVII)]
Indian ink and methylcellulose on canvas,
140 x 200 cm, Switzerland, October 2024



#insitu #surlemotif #contemporaryart #artcontemporain #peinturecontemporaine #contemporarypaintings #onlocation #landform #empreinte #imprint #indianink #encredechine #montanalogue #analogousmount #alps #collaboration #immanence #valais #rocks #accidents #erosion #elements

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💧🌏 Greg Cocks

The Basics of LiDAR - Light Detection and Ranging - Remote Sensing [tree focused]
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neonscience.org/resources/lear <-- shared tutorial
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[this post should not be considered an endorsement of any organisation, but is shared for learning purposes]
“LiDAR or Light Detection and Ranging is an active remote sensing system that can be used to measure vegetation height across wide areas.
This [tutorial] page… introduce[s the] fundamental LiDAR (or lidar) concepts including:
• What LiDAR data are.
• The key attributes of LiDAR data.
• How LiDAR data are used to measure trees...”

graphic / 3D visualisation - LiDAR data used to measure a tree stand
graphic / 3D visualisation - LiDAR data image of a stand of trees, side view, colour coded by depth from the ground
graphic / 3D visualisation - basics of the physics / technical aspects of how LiDAR data used to measure a tree stand
photo - two foresters measuring a tree manually by climbing
Public
💧🌏 Greg Cocks

Earth's Retreating Glaciers Are Creating Huge Alien Ecosystems | Future Emergence Of New Ecosystems Caused By Glacial Retreat
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interestingengineering.com/sci <-- shared technical article
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doi.org/10.1038/s41586-023-063 <-- shared paper
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💧🌏 Greg Cocks

The Kingdom of Bhutan [1965 cartography]
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collections.lib.uwm.edu/digita <-- link to map and details
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doi.org/10.1111/j.1467-8306.19 <-- shared paper’s note, 2010
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[“a yam between two boulders.” (China (Tibet) and India)]
“Contained in (work): Association of American Geographers Annals of the Association of American Geographers…
Relief shown by shading and spot heights…”

@americangeo@bird.makeup

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💧🌏 Greg Cocks

What Is A Digital Elevation Model (DEM)?- A Practical Guide
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equatorstudios.com/what-is-a-d <-- shared tutorial
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“A Digital Elevation Model (DEM) is a digital cartographic dataset that represents a continuous topographic elevation surface through a series of cells. Each cell represents the elevation (Z) of a feature at its location (X and Y). Digital Elevation Models are a “bare earth” representation because they only contain information about the elevation of geological (ground) features, such as valleys, mountains, and landslides, to name a few. They do not include any elevation data concerning non-ground features, such as vegetation or buildings...”
[read more at the link above...]

Public
💧🌏 Greg Cocks

Combination Of Aerial, Satellite, And UAV Photogrammetry For Quantifying Rock Glacier Kinematics In The Dry Andes Of Chile (30°S) Since The 1950s
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doi.org/10.3389/frsen.2021.784 <-- shared paper
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FrontiersCombination of Aerial, Satellite, and UAV Photogrammetry for Quantifying Rock Glacier Kinematics in the Dry Andes of Chile (30°S) Since the 1950sThe diachronic analysis of aerial and satellite imagery, uncrewed aerial vehicle (UAV) and in situ surveys obtained between 1956 and 2019 are employed to analyse landform surface kinematics for the Tapado site located in the Dry Andes of Chile. A feature tracking procedure was used between series of orthorectified and co-registered images to calculate surface velocities on several ice-debris landforms, including rock glaciers and debris-covered glaciers. For the active rock glaciers, the results exhibit typical viscous flow, though local destabilisation process seems to occur, increased velocities since 2000 (>1 m/yr) and terminus advance. Nevertheless, the debris-covered glaciers displays heterogeneous spatial patterns of surface velocities, together with collapse (downwasting) associated with the development of thermokarst depressions and supraglacial ponds. Our findings show that surface kinematics and multitemporal observations derived from different sensors are valuable tools for differentiating between glacial and periglacial features. The pluri-decadal time series since 1956 constitute a unique dataset for documenting the surface kinematics of creeping mountain permafrost in the Southern Hemisphere. The approach developed in this work offers a way forward to reconstruct the recent behaviour of glacial and periglacial features in the Andes, where archival aerial photographs are available but have not previously been processed rigorously to obtain an accurate assessme...
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