Dave MacLean
@daveatcogs.bsky.social
GIS Faculty, Centre of Geographic Sciences (COGS); Fellow, Royal Canadian Geographical Society; co-Director, Esri Canada Centre of Excellence (COGS). My posts
Just getting started on bluesky
Astronaut photos-of-Earth maps: https://isspix.com/MapTourHowTo
Just getting started on bluesky
Astronaut photos-of-Earth maps: https://isspix.com/MapTourHowTo
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pictures.
Just off the very NE coast of #Mozambique on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has 1) a link to the downloadable 400-mm high-res and 2) a hint to a second pin
Just off the very NE coast of #Mozambique on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has 1) a link to the downloadable 400-mm high-res and 2) a hint to a second pin
November 10, 2025 at 11:06 PM
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pictures.
Just off the very NE coast of #Mozambique on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has 1) a link to the downloadable 400-mm high-res and 2) a hint to a second pin
Just off the very NE coast of #Mozambique on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has 1) a link to the downloadable 400-mm high-res and 2) a hint to a second pin
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pic.
In the way south #AtlanticOcean north of #SouthGeorgia Island, on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
In the way south #AtlanticOcean north of #SouthGeorgia Island, on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
November 10, 2025 at 6:24 PM
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pic.
In the way south #AtlanticOcean north of #SouthGeorgia Island, on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
In the way south #AtlanticOcean north of #SouthGeorgia Island, on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
Quote-post @huubeggen.bsky.social: regarding Huub's #25YearsOnISS series of pic, 👇was taken 7 Nov 2007 of #PalmJumeirah.
Due south of #Dubai (location of ||+|| at photo time) on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 750-mm high-res
Due south of #Dubai (location of ||+|| at photo time) on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 750-mm high-res
November 10, 2025 at 5:56 PM
Quote-post @huubeggen.bsky.social: regarding Huub's #25YearsOnISS series of pic, 👇was taken 7 Nov 2007 of #PalmJumeirah.
Due south of #Dubai (location of ||+|| at photo time) on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 750-mm high-res
Due south of #Dubai (location of ||+|| at photo time) on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 750-mm high-res
Reposted by Dave MacLean
Mar 6, 2025: Captured by the OLI on Landsat 8, Kachemak Bay's cloudy waters showcase the effects of glacial flour and sediment from the Grewingk-Yalik Glacier Complex.
www.nasa.gov/image-article/kachemak-bays-stony-waters
www.nasa.gov/image-article/kachemak-bays-stony-waters
November 10, 2025 at 2:00 PM
Mar 6, 2025: Captured by the OLI on Landsat 8, Kachemak Bay's cloudy waters showcase the effects of glacial flour and sediment from the Grewingk-Yalik Glacier Complex.
www.nasa.gov/image-article/kachemak-bays-stony-waters
www.nasa.gov/image-article/kachemak-bays-stony-waters
Reposted by Dave MacLean
When asteroids slam into Earth they create a warm, wet local environment. These 3 guys dug through 78-million-year-old core samples to show how quickly life moves into the hellscape, to understand Earth history. news.westernu.ca/2025/09/life...
@westernu.ca @linneuni.bsky.social Canada & Sweden
@westernu.ca @linneuni.bsky.social Canada & Sweden
November 10, 2025 at 2:39 PM
When asteroids slam into Earth they create a warm, wet local environment. These 3 guys dug through 78-million-year-old core samples to show how quickly life moves into the hellscape, to understand Earth history. news.westernu.ca/2025/09/life...
@westernu.ca @linneuni.bsky.social Canada & Sweden
@westernu.ca @linneuni.bsky.social Canada & Sweden
Reposted by Dave MacLean
Today’s good news:
Just learned a 72-hour phone break works better than antidepressants. Also: Babylonians drew ghosts, Vatican runs on solar, and a couple found £230,000 in Tudor coins gardening.
Read more surprises:
Just learned a 72-hour phone break works better than antidepressants. Also: Babylonians drew ghosts, Vatican runs on solar, and a couple found £230,000 in Tudor coins gardening.
Read more surprises:
Taking a Phone Break Beats Antidepressants
Plus: Babylonian ghost rituals, Tudor treasure in the garden, and the world’s greenest tiny nation
medium.com
November 10, 2025 at 8:43 AM
Today’s good news:
Just learned a 72-hour phone break works better than antidepressants. Also: Babylonians drew ghosts, Vatican runs on solar, and a couple found £230,000 in Tudor coins gardening.
Read more surprises:
Just learned a 72-hour phone break works better than antidepressants. Also: Babylonians drew ghosts, Vatican runs on solar, and a couple found £230,000 in Tudor coins gardening.
Read more surprises:
Reposted by Dave MacLean
🔊#JourneySticks are an ancient geographical information system #GIS used for millennia.
Glimpses of a brilliant KS1 Y1 lesson 'Making a map of our route' by @oaknational.bsky.social stepping 'old' #GIS and 'new' #GIS + @aphextwin.bsky.social
#30DayMapChallenge Day 9: Analog
tinyurl.com/35y5wf5r
Glimpses of a brilliant KS1 Y1 lesson 'Making a map of our route' by @oaknational.bsky.social stepping 'old' #GIS and 'new' #GIS + @aphextwin.bsky.social
#30DayMapChallenge Day 9: Analog
tinyurl.com/35y5wf5r
November 8, 2025 at 10:26 PM
🔊#JourneySticks are an ancient geographical information system #GIS used for millennia.
Glimpses of a brilliant KS1 Y1 lesson 'Making a map of our route' by @oaknational.bsky.social stepping 'old' #GIS and 'new' #GIS + @aphextwin.bsky.social
#30DayMapChallenge Day 9: Analog
tinyurl.com/35y5wf5r
Glimpses of a brilliant KS1 Y1 lesson 'Making a map of our route' by @oaknational.bsky.social stepping 'old' #GIS and 'new' #GIS + @aphextwin.bsky.social
#30DayMapChallenge Day 9: Analog
tinyurl.com/35y5wf5r
Reposted by Dave MacLean
🍃🌉On this day 1940🌉🍃
'Galloping Gertie' Tacoma Narrows Bridge collapsed in 40mph/64kmh winds. Where were the viewpoints?
Tacoma-Kitsap pen link gone until 1950.
Created in @Esri ArcGIS Online using #MediaLayers
Webmap: arcg.is/0j9ibq
#30DayMapChallenge Day 7: Accessibility
'Galloping Gertie' Tacoma Narrows Bridge collapsed in 40mph/64kmh winds. Where were the viewpoints?
Tacoma-Kitsap pen link gone until 1950.
Created in @Esri ArcGIS Online using #MediaLayers
Webmap: arcg.is/0j9ibq
#30DayMapChallenge Day 7: Accessibility
November 6, 2025 at 10:46 PM
🍃🌉On this day 1940🌉🍃
'Galloping Gertie' Tacoma Narrows Bridge collapsed in 40mph/64kmh winds. Where were the viewpoints?
Tacoma-Kitsap pen link gone until 1950.
Created in @Esri ArcGIS Online using #MediaLayers
Webmap: arcg.is/0j9ibq
#30DayMapChallenge Day 7: Accessibility
'Galloping Gertie' Tacoma Narrows Bridge collapsed in 40mph/64kmh winds. Where were the viewpoints?
Tacoma-Kitsap pen link gone until 1950.
Created in @Esri ArcGIS Online using #MediaLayers
Webmap: arcg.is/0j9ibq
#30DayMapChallenge Day 7: Accessibility
Reposted by Dave MacLean
🌄 Good morning, everyone! The new week awaits you with a bluish view to the Altai Mountains near town Altay in #Kazakhstan. 🏔️ Isn't it a amazing view? 😍
We wish you a fabulous Monday! 😊
#BlueSkyMonday #Mountains #Landscape #Nature #CentralAsia #ThePhotoHour #EastCoastKin #MountainMonday #Scape
We wish you a fabulous Monday! 😊
#BlueSkyMonday #Mountains #Landscape #Nature #CentralAsia #ThePhotoHour #EastCoastKin #MountainMonday #Scape
November 10, 2025 at 10:49 AM
🌄 Good morning, everyone! The new week awaits you with a bluish view to the Altai Mountains near town Altay in #Kazakhstan. 🏔️ Isn't it a amazing view? 😍
We wish you a fabulous Monday! 😊
#BlueSkyMonday #Mountains #Landscape #Nature #CentralAsia #ThePhotoHour #EastCoastKin #MountainMonday #Scape
We wish you a fabulous Monday! 😊
#BlueSkyMonday #Mountains #Landscape #Nature #CentralAsia #ThePhotoHour #EastCoastKin #MountainMonday #Scape
Reposted by Dave MacLean
Just over two hours of star trails from last night, under bright moonlight. Looking towards Aquila. #Astronomy #Astrophotography
November 9, 2025 at 9:13 PM
Just over two hours of star trails from last night, under bright moonlight. Looking towards Aquila. #Astronomy #Astrophotography
Reposted by Dave MacLean
Good morning! Here’s your minute of peace & calm.
To enjoy the full 10-minute video, watch here: youtu.be/JzQVOefevhs?...
#OceanDevotion
To enjoy the full 10-minute video, watch here: youtu.be/JzQVOefevhs?...
#OceanDevotion
November 9, 2025 at 9:14 PM
Good morning! Here’s your minute of peace & calm.
To enjoy the full 10-minute video, watch here: youtu.be/JzQVOefevhs?...
#OceanDevotion
To enjoy the full 10-minute video, watch here: youtu.be/JzQVOefevhs?...
#OceanDevotion
Reposted by Dave MacLean
🗺️ 113 year old maps reborn 🗺️
1912 sketch maps by teacher George Nebel for a field trip from Wood Street School #Woolwich to Isle of Thanet, Kent (they travelled by ship!)
#MediaLayers @esriuk.bsky.social ArcGIS Online
#30DayMapChallenge Day 9: Analog
Map🙏 Kent Archives
arcg.is/1nr55b1
1912 sketch maps by teacher George Nebel for a field trip from Wood Street School #Woolwich to Isle of Thanet, Kent (they travelled by ship!)
#MediaLayers @esriuk.bsky.social ArcGIS Online
#30DayMapChallenge Day 9: Analog
Map🙏 Kent Archives
arcg.is/1nr55b1
November 9, 2025 at 10:07 AM
🗺️ 113 year old maps reborn 🗺️
1912 sketch maps by teacher George Nebel for a field trip from Wood Street School #Woolwich to Isle of Thanet, Kent (they travelled by ship!)
#MediaLayers @esriuk.bsky.social ArcGIS Online
#30DayMapChallenge Day 9: Analog
Map🙏 Kent Archives
arcg.is/1nr55b1
1912 sketch maps by teacher George Nebel for a field trip from Wood Street School #Woolwich to Isle of Thanet, Kent (they travelled by ship!)
#MediaLayers @esriuk.bsky.social ArcGIS Online
#30DayMapChallenge Day 9: Analog
Map🙏 Kent Archives
arcg.is/1nr55b1
Reposted by Dave MacLean
Krasheninnikov volcano in Kamchatka.
Image taken today by Sentinel-2.
Image taken today by Sentinel-2.
November 9, 2025 at 10:26 AM
Krasheninnikov volcano in Kamchatka.
Image taken today by Sentinel-2.
Image taken today by Sentinel-2.
Reposted by Dave MacLean
🌄 Good morning, this is neither Utah nor Arizona - this is #Kazakhstan !🏜️The mesas of the Ustyurt plateau at the Mangischlak peninsula are quite impressive. Isn't it? 😍 Have a great Sunday! 🤗
#stunday #photography #naturephotography #nature #art #scape #bluesky #eastcoastkin #centralasia #landscape
#stunday #photography #naturephotography #nature #art #scape #bluesky #eastcoastkin #centralasia #landscape
November 9, 2025 at 10:55 AM
🌄 Good morning, this is neither Utah nor Arizona - this is #Kazakhstan !🏜️The mesas of the Ustyurt plateau at the Mangischlak peninsula are quite impressive. Isn't it? 😍 Have a great Sunday! 🤗
#stunday #photography #naturephotography #nature #art #scape #bluesky #eastcoastkin #centralasia #landscape
#stunday #photography #naturephotography #nature #art #scape #bluesky #eastcoastkin #centralasia #landscape
Reposted by Dave MacLean
My yearly "Abandoned Nova Scotia" calendar always gets rave reviews! Makes a great gift, for you or someone else. $30 each plus shipping. Order direct from me at etsy.com/shop/SteveSkafte — or if you're in Annapolis County, send me a message to arrange free in-person pickup or delivery.
November 9, 2025 at 2:29 AM
My yearly "Abandoned Nova Scotia" calendar always gets rave reviews! Makes a great gift, for you or someone else. $30 each plus shipping. Order direct from me at etsy.com/shop/SteveSkafte — or if you're in Annapolis County, send me a message to arrange free in-person pickup or delivery.
Reposted by Dave MacLean
Day 7 of the #30DayMapChallenge - Accessibility - "Visualize travel time, barriers....." - Here is a map showing nighttime lights in the Korean Peninsula. The border between North and South is visible from space.
November 7, 2025 at 11:32 PM
Day 7 of the #30DayMapChallenge - Accessibility - "Visualize travel time, barriers....." - Here is a map showing nighttime lights in the Korean Peninsula. The border between North and South is visible from space.
Reposted by Dave MacLean
🔊Do you know the way to Kathmandu?
3D map: 2025 Imagery v 1967 Corona satellite via Nepali Times #MediaLayer @esriuk.bsky.social ArcGISOnline #Scene + GEBCO bathymetry 3.5 x exagg
c 200%⬆️ #UrbanSprawl शहरी विस्तार
+ @johnmaus.bsky.social 'Do Your Best'
#30DayMapChallenge Day 8: Urban
arcg.is/1iPyW10
3D map: 2025 Imagery v 1967 Corona satellite via Nepali Times #MediaLayer @esriuk.bsky.social ArcGISOnline #Scene + GEBCO bathymetry 3.5 x exagg
c 200%⬆️ #UrbanSprawl शहरी विस्तार
+ @johnmaus.bsky.social 'Do Your Best'
#30DayMapChallenge Day 8: Urban
arcg.is/1iPyW10
November 8, 2025 at 1:04 AM
🔊Do you know the way to Kathmandu?
3D map: 2025 Imagery v 1967 Corona satellite via Nepali Times #MediaLayer @esriuk.bsky.social ArcGISOnline #Scene + GEBCO bathymetry 3.5 x exagg
c 200%⬆️ #UrbanSprawl शहरी विस्तार
+ @johnmaus.bsky.social 'Do Your Best'
#30DayMapChallenge Day 8: Urban
arcg.is/1iPyW10
3D map: 2025 Imagery v 1967 Corona satellite via Nepali Times #MediaLayer @esriuk.bsky.social ArcGISOnline #Scene + GEBCO bathymetry 3.5 x exagg
c 200%⬆️ #UrbanSprawl शहरी विस्तार
+ @johnmaus.bsky.social 'Do Your Best'
#30DayMapChallenge Day 8: Urban
arcg.is/1iPyW10
Quote-post @huubeggen.bsky.social: the 5th 👇 in Huub's #25YearsOnISS series of pic.
Click & #ZoomWAYin on the western #Texas pin on the interactive map isspix.com/ISS073 for Huub's post; it also has link to the downloadable 800(!)-mm high-res
Click & #ZoomWAYin on the western #Texas pin on the interactive map isspix.com/ISS073 for Huub's post; it also has link to the downloadable 800(!)-mm high-res
November 8, 2025 at 12:50 AM
Quote-post @huubeggen.bsky.social: the 5th 👇 in Huub's #25YearsOnISS series of pic.
Click & #ZoomWAYin on the western #Texas pin on the interactive map isspix.com/ISS073 for Huub's post; it also has link to the downloadable 800(!)-mm high-res
Click & #ZoomWAYin on the western #Texas pin on the interactive map isspix.com/ISS073 for Huub's post; it also has link to the downloadable 800(!)-mm high-res
Reposted by Dave MacLean
"Exciting and entertaining from start to finish, and highly recommended." - Promoting Crime Fiction
order FINAL ORBIT: chrishadfield.ca/books/final-...
order FINAL ORBIT: chrishadfield.ca/books/final-...
November 7, 2025 at 1:29 PM
"Exciting and entertaining from start to finish, and highly recommended." - Promoting Crime Fiction
order FINAL ORBIT: chrishadfield.ca/books/final-...
order FINAL ORBIT: chrishadfield.ca/books/final-...
Head into !ndigo on Chain Lake Dr in #Halifax and find signed copies of @cmdr-hadfield.bsky.social ‘s recently released #FinalOrbit book.
I know there’s one at our house, wrapped for #Christmas, and I look forward to reading it!
I know there’s one at our house, wrapped for #Christmas, and I look forward to reading it!
November 7, 2025 at 3:41 PM
Head into !ndigo on Chain Lake Dr in #Halifax and find signed copies of @cmdr-hadfield.bsky.social ‘s recently released #FinalOrbit book.
I know there’s one at our house, wrapped for #Christmas, and I look forward to reading it!
I know there’s one at our house, wrapped for #Christmas, and I look forward to reading it!
Reposted by Dave MacLean
When you look closely at spider threads in backlight of the sun you can see how they split the light into colours. Best visible on camera when you turn it out-of-focus. #wondersofnature
November 7, 2025 at 11:19 AM
When you look closely at spider threads in backlight of the sun you can see how they split the light into colours. Best visible on camera when you turn it out-of-focus. #wondersofnature
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS picture series.
Along the coast of #Argentina on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
Along the coast of #Argentina on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
November 6, 2025 at 9:11 PM
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS picture series.
Along the coast of #Argentina on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
Along the coast of #Argentina on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 180-mm high-res
Reposted by Dave MacLean
Huge dust storms in Pakistan, seen by the @esa.int / @ec.europa.eu Sentinel-2B and Sentinel-3B satellites on 4th November.
Neither satellite was designed to monitor dust plumes, so it's impressive how much information they give us about the detail and extent of these storms!
Neither satellite was designed to monitor dust plumes, so it's impressive how much information they give us about the detail and extent of these storms!
November 6, 2025 at 8:32 PM
Huge dust storms in Pakistan, seen by the @esa.int / @ec.europa.eu Sentinel-2B and Sentinel-3B satellites on 4th November.
Neither satellite was designed to monitor dust plumes, so it's impressive how much information they give us about the detail and extent of these storms!
Neither satellite was designed to monitor dust plumes, so it's impressive how much information they give us about the detail and extent of these storms!
Quote-post @nasa-daily.bsky.social: nice product 👇from the #EarthKAM system (back in mission 57)
Near #LasVegas at that puff of smoke in the upper-left on the interactive map isspix.com/ISS073, click the orange pin for NASA IotD's post; also has links to article & high-res
Near #LasVegas at that puff of smoke in the upper-left on the interactive map isspix.com/ISS073, click the orange pin for NASA IotD's post; also has links to article & high-res
November 6, 2025 at 5:55 PM
Quote-post @nasa-daily.bsky.social: nice product 👇from the #EarthKAM system (back in mission 57)
Near #LasVegas at that puff of smoke in the upper-left on the interactive map isspix.com/ISS073, click the orange pin for NASA IotD's post; also has links to article & high-res
Near #LasVegas at that puff of smoke in the upper-left on the interactive map isspix.com/ISS073, click the orange pin for NASA IotD's post; also has links to article & high-res
Reposted by Dave MacLean
Another penguin colony 🐧🐧🐧
Image taken by Sentinel-2 on Sep. 27, 2025.
-71.98, 170.60
Image taken by Sentinel-2 on Sep. 27, 2025.
-71.98, 170.60
October 1, 2025 at 7:35 AM
Another penguin colony 🐧🐧🐧
Image taken by Sentinel-2 on Sep. 27, 2025.
-71.98, 170.60
Image taken by Sentinel-2 on Sep. 27, 2025.
-71.98, 170.60