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: today's edition👇for Huub's #25YearsOnISS series of pictures
In the extreme NW of #Tchad (where ||+|| was at photo time) on map isspix.com/ISS073, there is a pin for Huub's post; also has link to downloadable 50-mm high-res by #DanPettit
CC: @tubaniels.bsky.social
In the extreme NW of #Tchad (where ||+|| was at photo time) on map isspix.com/ISS073, there is a pin for Huub's post; also has link to downloadable 50-mm high-res by #DanPettit
CC: @tubaniels.bsky.social
November 25, 2025 at 9:35 PM
Quote-post @huubeggen.bsky.social: today's edition👇for Huub's #25YearsOnISS series of pictures
In the extreme NW of #Tchad (where ||+|| was at photo time) on map isspix.com/ISS073, there is a pin for Huub's post; also has link to downloadable 50-mm high-res by #DanPettit
CC: @tubaniels.bsky.social
In the extreme NW of #Tchad (where ||+|| was at photo time) on map isspix.com/ISS073, there is a pin for Huub's post; also has link to downloadable 50-mm high-res by #DanPettit
CC: @tubaniels.bsky.social
Quote-post @huubeggen.bsky.social: the 24 Nov 2025 edition 👇 of Huub's #25YearsOnISS series of pictures
In SW #Egypt (position of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 24-mm high-res by #LoralO'Hara
In SW #Egypt (position of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 24-mm high-res by #LoralO'Hara
November 25, 2025 at 9:31 PM
Quote-post @huubeggen.bsky.social: the 24 Nov 2025 edition 👇 of Huub's #25YearsOnISS series of pictures
In SW #Egypt (position of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 24-mm high-res by #LoralO'Hara
In SW #Egypt (position of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 24-mm high-res by #LoralO'Hara
Quote-post @huubeggen.bsky.social: oh, these blue hues!👇 in Huub's #25YearsOnISS series of pictures
Near #RumCay in the #Bahamas on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res
Near #RumCay in the #Bahamas on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res
November 25, 2025 at 9:26 PM
Quote-post @huubeggen.bsky.social: oh, these blue hues!👇 in Huub's #25YearsOnISS series of pictures
Near #RumCay in the #Bahamas on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res
Near #RumCay in the #Bahamas on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res
Quote-post @huubeggen.bsky.social: another lovely pick 👇in Huub's #25YearsOnISS series of pictures
At the location of the ||+|| at photo time, off the Atlantic Coast from #PuertoDeseado on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 70-mm high-res
At the location of the ||+|| at photo time, off the Atlantic Coast from #PuertoDeseado on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 70-mm high-res
November 25, 2025 at 9:16 PM
Quote-post @huubeggen.bsky.social: another lovely pick 👇in Huub's #25YearsOnISS series of pictures
At the location of the ||+|| at photo time, off the Atlantic Coast from #PuertoDeseado on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 70-mm high-res
At the location of the ||+|| at photo time, off the Atlantic Coast from #PuertoDeseado on the map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 70-mm high-res
(I'm catching up my quote-posts) From @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pictures.
On #VIE 's runway 16 ( #ZoomWAYin ) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 400-mm #CitiesAtNight high-res
On #VIE 's runway 16 ( #ZoomWAYin ) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 400-mm #CitiesAtNight high-res
November 25, 2025 at 9:05 PM
(I'm catching up my quote-posts) From @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pictures.
On #VIE 's runway 16 ( #ZoomWAYin ) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 400-mm #CitiesAtNight high-res
On #VIE 's runway 16 ( #ZoomWAYin ) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 400-mm #CitiesAtNight high-res
Quote-thread @huubeggen.bsky.social & @wed-explorer.bsky.social: very nice 👇 choice for a photo in northeastern #Malaysia & an associated "in my mind" pic 😀
On the interactive map isspix.com/ISS073, there are two pins for these posts; each also has link to the downloadable 240-mm high-
On the interactive map isspix.com/ISS073, there are two pins for these posts; each also has link to the downloadable 240-mm high-
November 25, 2025 at 8:38 PM
Quote-thread @huubeggen.bsky.social & @wed-explorer.bsky.social: very nice 👇 choice for a photo in northeastern #Malaysia & an associated "in my mind" pic 😀
On the interactive map isspix.com/ISS073, there are two pins for these posts; each also has link to the downloadable 240-mm high-
On the interactive map isspix.com/ISS073, there are two pins for these posts; each also has link to the downloadable 240-mm high-
Quote-post @huubeggen.bsky.social: wow 👇Santiago is such a sprawling city
On the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 310-mm high-res
On the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 310-mm high-res
November 25, 2025 at 7:36 PM
Quote-post @huubeggen.bsky.social: wow 👇Santiago is such a sprawling city
On the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 310-mm high-res
On the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 310-mm high-res
Quote-post @huubeggen.bsky.social: another 👇of Huub's #25YearsOnISS series of pictures
~600 km west of northern #Chile on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to downloadable 400-mm high
CC: @beatriceheinze.bsky.social @danielmachacek.bsky.social
~600 km west of northern #Chile on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to downloadable 400-mm high
CC: @beatriceheinze.bsky.social @danielmachacek.bsky.social
November 25, 2025 at 7:30 PM
Quote-post @huubeggen.bsky.social: another 👇of Huub's #25YearsOnISS series of pictures
~600 km west of northern #Chile on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to downloadable 400-mm high
CC: @beatriceheinze.bsky.social @danielmachacek.bsky.social
~600 km west of northern #Chile on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to downloadable 400-mm high
CC: @beatriceheinze.bsky.social @danielmachacek.bsky.social
Reposted by Dave MacLean
Aftermath of Hayli Gubbi volcano eruption in Ethiopia.
Area covered by volcanic ash and tephra is ~12 500 km2.
Images taken by Sentinel-3.
Area covered by volcanic ash and tephra is ~12 500 km2.
Images taken by Sentinel-3.
November 25, 2025 at 9:54 AM
Aftermath of Hayli Gubbi volcano eruption in Ethiopia.
Area covered by volcanic ash and tephra is ~12 500 km2.
Images taken by Sentinel-3.
Area covered by volcanic ash and tephra is ~12 500 km2.
Images taken by Sentinel-3.
Reposted by Dave MacLean
I shot one more last night with my duct tape and a 690 Singh Ray Infrared mickey rigged I phone which produced arguably one of the best faux color 690nm images I have ever done... Sunset last night after the last post I did... Hope you enjoy it not to bad for a half a roll of duct tape! #photography
November 25, 2025 at 10:03 AM
I shot one more last night with my duct tape and a 690 Singh Ray Infrared mickey rigged I phone which produced arguably one of the best faux color 690nm images I have ever done... Sunset last night after the last post I did... Hope you enjoy it not to bad for a half a roll of duct tape! #photography
Reposted by Dave MacLean
'Arcade Fire'
101,637 ångström frames acquired by Solar Dynamics Observatory are conformed, repaired, graded, blended, rescaled & retimed to create the film with music by Chris Zabriskie.
youtu.be/hvVUOPEb_no
101,637 ångström frames acquired by Solar Dynamics Observatory are conformed, repaired, graded, blended, rescaled & retimed to create the film with music by Chris Zabriskie.
youtu.be/hvVUOPEb_no
SDO - Arcade Fire
YouTube video by Seán Doran
youtu.be
November 24, 2025 at 4:16 PM
'Arcade Fire'
101,637 ångström frames acquired by Solar Dynamics Observatory are conformed, repaired, graded, blended, rescaled & retimed to create the film with music by Chris Zabriskie.
youtu.be/hvVUOPEb_no
101,637 ångström frames acquired by Solar Dynamics Observatory are conformed, repaired, graded, blended, rescaled & retimed to create the film with music by Chris Zabriskie.
youtu.be/hvVUOPEb_no
Reposted by Dave MacLean
🔊🎶Hexagons of Grammichele
Sicily, Italy: #PlannedSettlement 1693 after #earthquake at Occhiolà
👣5.34km/3.32mi via @_outdooractive_
@esriuk.bsky.social ArcGISOnline w #FireflyIcons by
@johnelson.bsky.social
✝️RIP Ornella Vanoni d 21 Nov 2025
arcg.is/e9OLL
#30DayMapChallenge Day 25: Hexagons
Sicily, Italy: #PlannedSettlement 1693 after #earthquake at Occhiolà
👣5.34km/3.32mi via @_outdooractive_
@esriuk.bsky.social ArcGISOnline w #FireflyIcons by
@johnelson.bsky.social
✝️RIP Ornella Vanoni d 21 Nov 2025
arcg.is/e9OLL
#30DayMapChallenge Day 25: Hexagons
November 24, 2025 at 11:29 PM
🔊🎶Hexagons of Grammichele
Sicily, Italy: #PlannedSettlement 1693 after #earthquake at Occhiolà
👣5.34km/3.32mi via @_outdooractive_
@esriuk.bsky.social ArcGISOnline w #FireflyIcons by
@johnelson.bsky.social
✝️RIP Ornella Vanoni d 21 Nov 2025
arcg.is/e9OLL
#30DayMapChallenge Day 25: Hexagons
Sicily, Italy: #PlannedSettlement 1693 after #earthquake at Occhiolà
👣5.34km/3.32mi via @_outdooractive_
@esriuk.bsky.social ArcGISOnline w #FireflyIcons by
@johnelson.bsky.social
✝️RIP Ornella Vanoni d 21 Nov 2025
arcg.is/e9OLL
#30DayMapChallenge Day 25: Hexagons
Reposted by Dave MacLean
Eruption of Hayli Gubbi volcano in Ethiopia.
Images taken today by Meteosat weather satellite.
Volcanic ash & SO2.
Images taken today by Meteosat weather satellite.
Volcanic ash & SO2.
November 23, 2025 at 6:26 PM
Eruption of Hayli Gubbi volcano in Ethiopia.
Images taken today by Meteosat weather satellite.
Volcanic ash & SO2.
Images taken today by Meteosat weather satellite.
Volcanic ash & SO2.
Listen … and enjoy 👇
November 23, 2025 at 11:59 AM
Listen … and enjoy 👇
Reposted by Dave MacLean
🌄 Good morning from Lake Tortkara in eastern #Kazakhstan. Would you like to be there, too? 🏞️
Happy good Sunday! 🏖️
#lake #mountains #nature #autumn #fall #calm #tranquility #landscapephotography #stunday #blueskyartshow #naturephotography #kazakhstan #explorebc #hiking #camping #travel #centralasia
Happy good Sunday! 🏖️
#lake #mountains #nature #autumn #fall #calm #tranquility #landscapephotography #stunday #blueskyartshow #naturephotography #kazakhstan #explorebc #hiking #camping #travel #centralasia
November 23, 2025 at 11:05 AM
🌄 Good morning from Lake Tortkara in eastern #Kazakhstan. Would you like to be there, too? 🏞️
Happy good Sunday! 🏖️
#lake #mountains #nature #autumn #fall #calm #tranquility #landscapephotography #stunday #blueskyartshow #naturephotography #kazakhstan #explorebc #hiking #camping #travel #centralasia
Happy good Sunday! 🏖️
#lake #mountains #nature #autumn #fall #calm #tranquility #landscapephotography #stunday #blueskyartshow #naturephotography #kazakhstan #explorebc #hiking #camping #travel #centralasia
Reposted by Dave MacLean
🔊Using #GIS to visualise the impact of physical and human processes on coasts🌊
@oaknational.bsky.social lesson stepped explanation demonstrating #GIS integration at KS4 GCSE Geography for coastal erosion on Holderness peninsula UK
tinyurl.com/mwpn2229
#30DayMapChallenge Day 23: Process
@oaknational.bsky.social lesson stepped explanation demonstrating #GIS integration at KS4 GCSE Geography for coastal erosion on Holderness peninsula UK
tinyurl.com/mwpn2229
#30DayMapChallenge Day 23: Process
November 22, 2025 at 11:34 PM
🔊Using #GIS to visualise the impact of physical and human processes on coasts🌊
@oaknational.bsky.social lesson stepped explanation demonstrating #GIS integration at KS4 GCSE Geography for coastal erosion on Holderness peninsula UK
tinyurl.com/mwpn2229
#30DayMapChallenge Day 23: Process
@oaknational.bsky.social lesson stepped explanation demonstrating #GIS integration at KS4 GCSE Geography for coastal erosion on Holderness peninsula UK
tinyurl.com/mwpn2229
#30DayMapChallenge Day 23: Process
Quote-post @theseaning.bsky.social: this 👇is a fantastic video of aurora photos taken by astronauts #DonPettit & #ButchWilmore
Click pin at #PrinceGeorge, #BritishColumbia (appears a few times in the video) on isspix.com/ISS072 for Seán's post
CC: @david.williamsons.net @rsimmon.bsky.social 1/2
Click pin at #PrinceGeorge, #BritishColumbia (appears a few times in the video) on isspix.com/ISS072 for Seán's post
CC: @david.williamsons.net @rsimmon.bsky.social 1/2
November 22, 2025 at 5:25 PM
Quote-post @theseaning.bsky.social: this 👇is a fantastic video of aurora photos taken by astronauts #DonPettit & #ButchWilmore
Click pin at #PrinceGeorge, #BritishColumbia (appears a few times in the video) on isspix.com/ISS072 for Seán's post
CC: @david.williamsons.net @rsimmon.bsky.social 1/2
Click pin at #PrinceGeorge, #BritishColumbia (appears a few times in the video) on isspix.com/ISS072 for Seán's post
CC: @david.williamsons.net @rsimmon.bsky.social 1/2
Reposted by Dave MacLean
Happy birthday to Yvan Cournoyer, born on this day in Drummondville, Quebec in 1943!
Nicknamed The Roadrunner for his speed on the ice, he won 10 Stanley Cups with the Montreal Canadiens in his Hall of Fame career. He also won a Conn Smythe and played in the Summit Series.
Nicknamed The Roadrunner for his speed on the ice, he won 10 Stanley Cups with the Montreal Canadiens in his Hall of Fame career. He also won a Conn Smythe and played in the Summit Series.
November 22, 2025 at 12:01 PM
Happy birthday to Yvan Cournoyer, born on this day in Drummondville, Quebec in 1943!
Nicknamed The Roadrunner for his speed on the ice, he won 10 Stanley Cups with the Montreal Canadiens in his Hall of Fame career. He also won a Conn Smythe and played in the Summit Series.
Nicknamed The Roadrunner for his speed on the ice, he won 10 Stanley Cups with the Montreal Canadiens in his Hall of Fame career. He also won a Conn Smythe and played in the Summit Series.
Reposted by Dave MacLean
This region shows the pattern again — now not two but four distinct #dust layers moving seaward. Each plume comes from a different soil source, and eventually the lighter, sand-rich layer merges them into one diffuse cloud over the Mediterranean.⚪️🟠🟤
🛰Meteosat @eumetsat.int
✂️Visualized @zoom.earth
🛰Meteosat @eumetsat.int
✂️Visualized @zoom.earth
November 21, 2025 at 11:26 AM
This region shows the pattern again — now not two but four distinct #dust layers moving seaward. Each plume comes from a different soil source, and eventually the lighter, sand-rich layer merges them into one diffuse cloud over the Mediterranean.⚪️🟠🟤
🛰Meteosat @eumetsat.int
✂️Visualized @zoom.earth
🛰Meteosat @eumetsat.int
✂️Visualized @zoom.earth
Yesterday at noon, we enjoyed GIS Day cupcakes at the Centre of Geographic Sciences (NSCC-COGS).
Thank you to the Geomatics Association of Nova Scotia (GANS) for sponsoring these and to Patti for baking them!
Seen here with some of our Marine Geomatics students.
#GISDay #GANS #COGS
Thank you to the Geomatics Association of Nova Scotia (GANS) for sponsoring these and to Patti for baking them!
Seen here with some of our Marine Geomatics students.
#GISDay #GANS #COGS
November 20, 2025 at 2:10 PM
Reposted by Dave MacLean
🔊Thrown Around🔊
Atlantis/Conic Equidistant/Equirectangular; Orthographic/Patterson/Stereographic/Waterman Butterfly/Winkel Tripel
#SST Nov 2025 centred on #NullIsland
🙏 @cambecc.bsky.social
🙏🎵 @jamesblake
#30DayMapChallenge #GoGIS4GA
Day 19: Projections #GISDay earth.nullschool.net#current/ocea...
Atlantis/Conic Equidistant/Equirectangular; Orthographic/Patterson/Stereographic/Waterman Butterfly/Winkel Tripel
#SST Nov 2025 centred on #NullIsland
🙏 @cambecc.bsky.social
🙏🎵 @jamesblake
#30DayMapChallenge #GoGIS4GA
Day 19: Projections #GISDay earth.nullschool.net#current/ocea...
November 18, 2025 at 10:08 PM
🔊Thrown Around🔊
Atlantis/Conic Equidistant/Equirectangular; Orthographic/Patterson/Stereographic/Waterman Butterfly/Winkel Tripel
#SST Nov 2025 centred on #NullIsland
🙏 @cambecc.bsky.social
🙏🎵 @jamesblake
#30DayMapChallenge #GoGIS4GA
Day 19: Projections #GISDay earth.nullschool.net#current/ocea...
Atlantis/Conic Equidistant/Equirectangular; Orthographic/Patterson/Stereographic/Waterman Butterfly/Winkel Tripel
#SST Nov 2025 centred on #NullIsland
🙏 @cambecc.bsky.social
🙏🎵 @jamesblake
#30DayMapChallenge #GoGIS4GA
Day 19: Projections #GISDay earth.nullschool.net#current/ocea...
Reposted by Dave MacLean
Beyond amazing to be #1, 2, 4 and 5 bestsellers this week! Thanks @winnipegfreepress.com!
November 20, 2025 at 12:50 AM
Beyond amazing to be #1, 2, 4 and 5 bestsellers this week! Thanks @winnipegfreepress.com!
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pictures.
Along #Australia 's eastern coast on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 500-mm high-res
Along #Australia 's eastern coast on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 500-mm high-res
November 20, 2025 at 12:44 AM
Quote-post @huubeggen.bsky.social: another 👇 in Huub's #25YearsOnISS series of pictures.
Along #Australia 's eastern coast on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 500-mm high-res
Along #Australia 's eastern coast on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 500-mm high-res
Quote-post @huubeggen.bsky.social: really liking these 👇 mosaicked pics
Along the #Mississippi River between #Arkansas & Mississippi on the interactive map isspix.com/ISS073, there are two pins for Huub's post; they also have links to downloadable 400-mm high-res images by astronaut #ZenaCardman
Along the #Mississippi River between #Arkansas & Mississippi on the interactive map isspix.com/ISS073, there are two pins for Huub's post; they also have links to downloadable 400-mm high-res images by astronaut #ZenaCardman
November 20, 2025 at 12:35 AM
Quote-post @huubeggen.bsky.social: really liking these 👇 mosaicked pics
Along the #Mississippi River between #Arkansas & Mississippi on the interactive map isspix.com/ISS073, there are two pins for Huub's post; they also have links to downloadable 400-mm high-res images by astronaut #ZenaCardman
Along the #Mississippi River between #Arkansas & Mississippi on the interactive map isspix.com/ISS073, there are two pins for Huub's post; they also have links to downloadable 400-mm high-res images by astronaut #ZenaCardman
Quote-post @huubeggen.bsky.social: nice to see 👇 this #moon pic
Near central #Gabon (location of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res by astronaut #KimiyaYui
Near central #Gabon (location of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res by astronaut #KimiyaYui
November 20, 2025 at 12:13 AM
Quote-post @huubeggen.bsky.social: nice to see 👇 this #moon pic
Near central #Gabon (location of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res by astronaut #KimiyaYui
Near central #Gabon (location of ||+|| at photo time) on the interactive map isspix.com/ISS073, there is a pin for Huub's post; it also has link to the downloadable 50-mm high-res by astronaut #KimiyaYui