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RSS Feed for Wolfram Community showing any discussions tagged with Geographic Information System sorted by active.[WSRI26] A Remote Sensing Methodology for Automatic Treeline Detection and Analysis
https://community.wolfram.com/groups/-/m/t/3763077
![A Remote Sensing Methodology for Automatic Treeline Detection and Analysis][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=image-2026-07-17T00-19-02Z.png&userId=3760314
[2]: https://www.wolframcloud.com/obj/43409420-7b55-4d36-8573-e4dbc38fdeabSiddhi Patel2026-07-17T00:20:54Z[WSRI26] Time Is All You Need: A Tubular Representation of Historical Borders
https://community.wolfram.com/groups/-/m/t/3761669
![Time Is All You Need: A Tubular Representation of Historical Borders][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Macedonia.png&userId=3760172
[2]: https://www.wolframcloud.com/obj/e8f77bba-92e8-4fe7-9f19-f87007ff4577Alejandro Barranco Pérez2026-07-16T16:03:12Z[WSRP26] Investigating shifting monarch butterfly migratory patterns
https://community.wolfram.com/groups/-/m/t/3752821
![Investigating shifting monarch butterfly migratory patterns][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=WSRP_2026_listofPopandTempMaps.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/f916f4a2-d862-47a8-bbed-016b7c1a29aaAva Fan2026-07-09T21:20:29Z[WSRP26] Optimizing photovoltaic solar panel arrangement on irregularly shaped roofs
https://community.wolfram.com/groups/-/m/t/3751860
![Optimizing photovoltaic solar panel arrangement on irregularly shaped roofs][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Screenshot2026-07-09at9.04.16%E2%80%AFAM.png&userId=3751052
[2]: https://www.wolframcloud.com/obj/d17a4d7c-40c7-4304-bdb5-4cd65f1e96adEllie Lee2026-07-09T20:12:01Z[WSRP26] Optimizing rentable bike stations in urban environments
https://community.wolfram.com/groups/-/m/t/3754048
![Optimizing rentable bike stations in urban environments][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Screenshot2026-07-09160400.png&userId=3753045
[2]: https://www.wolframcloud.com/obj/3176c21d-b666-4731-a896-d839887d61f7Jason Yao2026-07-10T00:51:45Z[WSRP26] Using cellular automata to predict flood plains through water spread and ground absorption
https://community.wolfram.com/groups/-/m/t/3753304
![Using cellular automata to predict flood plains through water spread and ground absorption][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Untitled.png&userId=3748591
[2]: https://www.wolframcloud.com/obj/73882497-dccd-4122-9aeb-d7e16057e1afSuvid Bordia2026-07-09T22:41:01ZPleistocene-Holocene Sea Level 500K Years Change UK/European Coastlines
https://community.wolfram.com/groups/-/m/t/1609980
![enter image description here][1]
The Pleistocene Epoch ended 12,000 years ago, making way for the Holocene Epoch which continues to today. During the peak of the last glacial episode, tremendous amounts of water was locked away in the glaciers which caused sea levels to drop. As the Pleistocene came to a close, glaciers from the last glacial episode were melted which caused the sea levels to rise. The following exploration uses data from De Boer, B., R.S.W. Van de Wal, R. Bintanja, L.J. Lourens and E. Tuenter, "Cenozoic global ice-volume and temperature simulations with 1-D ice-sheet models forced by benthic d18O records", Annals of Glaciology, 51 (55), 23-33, 2010.
sealeveldata = Transpose[
QuantityMagnitude[
Normal[Values[
ResourceData[
"Sea Level and Temperatures Over the Last 40 Million \
Years"][{"TimeBeforePresent", "SeaLevel"}]]]]];
Over the last 40 million years, the global temperatures and sea levels have changed. Prior to 2.5 million years ago, the global sea level tended to be higher than it is today as global temperatures were warmer.
ListPlot[sealeveldata, Joined -> True, Frame -> True, PlotRange -> All,
FrameLabel -> {{None,
"Sea Level Change (m)"}, {"Millions of Years Ago", None}},
FrameTicks -> {{Table[{i, i}, {i, -140, 80, 20}],
Table[{i, i}, {i, -140, 80,
20}]}, {Table[{i, -i/1000000}, {i, -40000000, 0, 5000000}],
Table[{i, -i/1000000}, {i, -40000000, 0, 5000000}]}},
ImageSize -> 550]
![global sea level changes over the last 40 million years][2]
Starting about 2.5 million years ago, as the Pleistocene Epoch was starting, global temperatures started to drop and permanent ice started to form at the poles. We entered an ice age. During the Pleistocene, temperatures varied wildly and glaciers advanced and retreated in many pulses. Today, there is still permanent ice at the poles so we are still in an ice age. But we are between cold pulses, so we are in an interglacial period within the current ice age.
ListPlot[sealeveldata, Joined -> True, Frame -> True,
PlotRange -> {{-2500000, 0}, {-150, 10}},
FrameTicks -> {{Table[{i, i}, {i, -140, 0, 20}],
Table[{i, i}, {i, -140, 0,
20}]}, {Table[{i, -i/1000}, {i, -2500000, 0, 200000}],
Table[{i, -i/1000}, {i, -2500000, 0, 200000}]}},
FrameLabel -> {{None,
"Sea Level Change (m)"}, {"Thousands of Years Ago", None}},
ImageSize -> 550]
![global sea level changes over the last 2.5 million years][3]
We can focus in on the peak of the last glacial episode to find the lowest sea level which happened about 20,000 years ago, when the glaciers locked up a large amount of water from the oceans.
ListPlot[sealeveldata, Joined -> True, Frame -> True,
PlotRange -> {{-24000, 0}, {-150, 10}},
FrameTicks -> {{Table[{i, i}, {i, -140, 0, 20}],
Table[{i, i}, {i, -140, 0, 20}]}, {Table[{i, -i/1000}, {i, -24000,
0, 2000}], Table[{i, -i/1000}, {i, -24000, 0, 2000}]}},
FrameLabel -> {{None,
"Sea Level Change (m)"}, {"Thousands of Years Ago", None}},
ImageSize -> 550]
![global sea level changes over the last 24,000 years][4]
For more continuous coverage, we can interpolate the data.
seaint = Interpolation[sealeveldata, InterpolationOrder -> 1];
To see the effects that changing sea levels had on the coast of the U.K. and Europe, first we need to obtain the elevation data using GeoElevationData. The following form works nicely using the forthcoming version 12:
data = GeoElevationData[
Entity["City", {"London", "GreaterLondon", "UnitedKingdom"}],
GeoRange -> Quantity[800, "Miles"], GeoProjection -> Automatic,
UnitSystem -> "Metric"];
You can get similar results from 11.3 and earlier using the following definition:
data = GeoElevationData[
GeoDisk[Entity[
"City", {"London", "GreaterLondon", "UnitedKingdom"}],
Quantity[800, "Miles"]], UnitSystem -> "Metric"];
The following variations all use the data generated from version 12. At the greatest extent of the glacial event, the U.K. was connected to mainland Europe. The connecting land is often referred to as [Doggerland][5]. As long as the U.K. and Europe were connected, hunter-gatherers were able to move back and forth.
With[{ybp = -22000},
ReliefPlot[Reverse[data],
PlotRange -> {Full, Full, {seaint[ybp], All}}, ImageSize -> 600,
ColorFunction -> "FallColors", ClippingStyle -> RGBColor[0, .2, .5],
PerformanceGoal -> "Quality",
PlotLabel -> Row[{-Round[ybp], " years ago"}],
Epilog -> {Text[Style["Doggerland", 12, White], {320, 250}]},
FrameTicks -> All]]
![sea level effects on the U.K. and Europe 22,000 years ago][6]
By about 10,500 years ago (8,500 BCE) sea levels rose to the point that the U.K. had basically separated from the European mainland. A small uprise known as the Dogger Bank was still exposed as an island.
With[{ybp = -10500},
ReliefPlot[Reverse[data],
PlotRange -> {Full, Full, {seaint[ybp], All}}, ImageSize -> 600,
ColorFunction -> "FallColors", ClippingStyle -> RGBColor[0, .2, .5],
PerformanceGoal -> "Quality",
PlotLabel -> Row[{-Round[ybp], " years ago"}],
Epilog -> {Text[Style["Dogger Bank", 12, White], {300, 300}]}]]
![sea level effects on the U.K. and Europe 10,500 years ago][7]
By 9,000 years ago (7,000 BCE), the Dogger Bank had also submerged.
With[{ybp = -9000},
ReliefPlot[Reverse[data],
PlotRange -> {Full, Full, {seaint[ybp], All}}, ImageSize -> 600,
ColorFunction -> "FallColors", ClippingStyle -> RGBColor[0, .2, .5],
PerformanceGoal -> "Quality",
PlotLabel -> Row[{-Round[ybp], " years ago"}]]]
![sea level effects on the U.K. and Europe 9,000 years ago][8]
An animated version can be created as well. [Here is a link][9] I created showing the variation in sea level over the last 500,000 years.
Time will tell if we will enter a new glacial period and see the glaciers once again advance as they have many times in the last 2.5 million years.
&[Wolfram Notebook][10]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=test4_27_9_21-min.gif&userId=20103
[2]: https://community.wolfram.com//c/portal/getImageAttachment?filename=FullData.png&userId=25355
[3]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Pleistocene.png&userId=25355
[4]: https://community.wolfram.com//c/portal/getImageAttachment?filename=GlacialMaximum.png&userId=25355
[5]: https://en.wikipedia.org/wiki/Doggerland
[6]: https://community.wolfram.com//c/portal/getImageAttachment?filename=3616Doggerland.png&userId=25355
[7]: https://community.wolfram.com//c/portal/getImageAttachment?filename=DoggerBank.png&userId=25355
[8]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Recent.png&userId=25355
[9]: https://vimeo.com/316422438
[10]: https://www.wolframcloud.com/obj/ee74ffc8-a7e9-4d91-87ac-dd4f436283f1
[backup video link]: https://vimeo.com/316422438Jeffrey Bryant2019-02-10T20:39:02Z[WSRP26] Examining historical country overlap and contested regions
https://community.wolfram.com/groups/-/m/t/3754029
![Examining historical country overlap and contested regions][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=FullMapImage2.png&userId=3753222
[2]: https://www.wolframcloud.com/obj/bd4dc5a2-61d1-4263-a3c8-d95fd96079beSuzette Head2026-07-10T00:46:31ZNew in Wolfram V15: my favourite three improvements
https://community.wolfram.com/groups/-/m/t/3734779
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/eeb68717-bef4-475a-a104-afd00c314dc2Jon McLoone2026-06-16T19:16:47ZFinding yourself at sea: the mathematics of celestial navigation
https://community.wolfram.com/groups/-/m/t/3743363
![Finding yourself at sea: the mathematics of celestial navigation][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=TheMathematicsofCelestialNavigation.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/ac4a37f9-8b2f-4174-9fe0-6a0cdfb3f7b7Marco Thiel2026-07-02T18:55:18ZSeismic wave propagation across the globe: earthquakes vs. nuclear explosions
https://community.wolfram.com/groups/-/m/t/3742365
![Seismic wave propagation across the globe: earthquakes vs. nuclear explosions][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=SeismicWavePropagationAcrosstheGlobe.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/1c7bc639-d426-43e6-86b0-c1387ec733d6Marco Thiel2026-07-01T14:53:51ZBird migration paths: seasonal maps and population centroids from massive eBird datasets
https://community.wolfram.com/groups/-/m/t/3742012
![Bird migration paths: seasonal maps and population centroids from massive eBird datasets][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Bird_migration.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/c4b2223c-65e8-49a1-9831-39a1de2ca62bMarco Thiel2026-06-30T18:16:33ZAurora monitor: a real-time space-weather and aurora-visibility dashboard
https://community.wolfram.com/groups/-/m/t/3741265
![Aurora monitor: a real-time space-weather and aurora-visibility dashboard][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Auroramonitordashboard.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/31e1d078-476e-4847-b5c5-aa924cdc6918Marco Thiel2026-06-29T12:26:20ZPhases of Solar System objects using GeoGraphics: new features in V15
https://community.wolfram.com/groups/-/m/t/3739001
![Phases of Solar System objects using GeoGraphics: new features in V15][1]
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[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=PhasesofSolarSystemobjectsusingGeoGraphics.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/11875311-9c4e-4256-93fa-b0b18d20ff28Jeffrey Bryant2026-06-24T19:03:25ZNUKEMAP-extended: nuclear weapons effects engine with WSEG-10 fallout, terrain & GridPop
https://community.wolfram.com/groups/-/m/t/3737756
![NUKEMAP-extended: nuclear weapons effects engine with WSEG-10 fallout, terrain & GridPop][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=NUKEMAP-extended.png&userId=20103
[2]: https://www.wolframcloud.com/obj/e1a8b2e4-62e7-4079-bb27-99148b492f04Marco Thiel2026-06-22T15:01:36ZThe computational assyriologist - Part III: reading nineteen thousand dark tablets
https://community.wolfram.com/groups/-/m/t/3735081
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/93899f53-f7d8-4101-bace-5c6a7989c539Marco Thiel2026-06-17T14:13:49ZThe computational assyriologist - Part II: cuneiform as a research instrument
https://community.wolfram.com/groups/-/m/t/3735072
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/eed9ae35-b97f-4549-a596-3c487937f78dMarco Thiel2026-06-17T14:11:07ZReading tree rings: Fennoscandia dendroclimatology, summer temperature & the divergence problem
https://community.wolfram.com/groups/-/m/t/3733750
![Reading tree rings: Fennoscandia dendroclimatology, summer temperature & the divergence problem][1]
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[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Video-a4b76ff8-a043-4bc7-8f54-a65f0318af1f-optimize.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/c2585321-b448-4279-a3ea-e81377d50aefMarco Thiel2026-06-15T15:31:51ZVAAC ash-cloud bulletin parsing & ERA5 flight-level advection for volcanic plume dispersion
https://community.wolfram.com/groups/-/m/t/3732387
![VAAC ash-cloud bulletin parsing & ERA5 flight-level advection for volcanic plume dispersion][1]
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[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=VAAC.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/54bcaa72-193d-4511-8a23-125a093cb430Marco Thiel2026-06-12T12:01:52Zp-adic distance: a century-old number theory tool for robust hierarchical classification
https://community.wolfram.com/groups/-/m/t/3729588
![p-adic distance: a century-old number theory tool for robust hierarchical classification][1]
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[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Thep-adicDistanceforHierarchicalData.png&userId=20103
[2]: https://www.wolframcloud.com/obj/80eb302f-91b8-4e09-a948-8eeaae22d9a9Marco Thiel2026-06-08T14:26:34Z