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Here's Mine ...What's Yours? [Mapping Process]

Basiiczxx

Member
Joined
Jul 5, 2019
Messages
90
Location
Fort Drum, NY
When using good earth pro, how exact does the historical imaging work? Can I just pic a time of year and see that area? I want to use it to identify oaks by looking at the time of year when leafs change.
 

Stump06

Well-Known Member
Joined
Jan 15, 2018
Messages
259
Location
SE GA
When using good earth pro, how exact does the historical imaging work? Can I just pic a time of year and see that area? I want to use it to identify oaks by looking at the time of year when leafs change.
It has a slider bar and you can slide it to the different months/year that the last pic was taken. It may vary over different areas but it usually goes like 11/2018, 3/2018,12/2016, 5/2016. Not usually month to month, it kinda jumps around some but it cane still be helpful.
 

Allegheny Tom

Well-Known Member
SH Member
Joined
Feb 4, 2018
Messages
2,625
Location
Western Pennsylvania
It has a slider bar and you can slide it to the different months/year that the last pic was taken. It may vary over different areas but it usually goes like 11/2018, 3/2018,12/2016, 5/2016. Not usually month to month, it kinda jumps around some but it cane still be helpful.
The pic quality of individual dates can vary a lot. Even on pics taken during the same month (of different years) can really differ. Must be from atmospheric differences on at the time the image was taken?
Some of the very earliest google earth images are really bad...very blurry.
And you might think that the latest images would be the clearest, most high quality images, but it isn't always the case. Always check the historical imagery to see which images are clearest. And occasionally they are winter images with snow on the ground.
The more images over multiple years, taken in more seasons, the better.

Sent from my SM-G935V using Tapatalk
 
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GCTerpfan

Moderator
Staff member
SH Member
Joined
Aug 11, 2017
Messages
1,856
Location
Garrett County, MD
The pic quality of individual dates can vary a lot. Even on pics taken during the same month (of different years) can really differ. Must be from atmospheric differences on at the time the image was taken?
Most of the imagery you see is from aerial photography and the resolution is a function of the altitude of the airplane when the photos were taken. Flying at a lower altitude creates better images but, takes longer to collect and process the data because it requires more photos to cover the same area. Because the imagery GE uses is imagery collected by different organizations for different purposes it's at different resolutions. That's also why you can pan around and find edges where the coverage of one imagery set ends and imagery of different resolution/dates begin.
 

Davis21

Well-Known Member
Joined
Sep 27, 2018
Messages
232
What's your method? Here is mine

Where I Begin
  • My favorite, and where I ALWAYS start, is with google earth pro - specifically, I use the historical imaging feature and vacillate images between multiple time periods. This allows me to see high/low water, spring/summer, fall/winter etc. Some areas have more updated images than others but for river bottoms in particular, I've found a specific time-period that tells me a lot about bedding/travel.
Then, depending if I'm hunting in hilly terrain or flat:

Hilly Terrain
  • I like Hillmap to compare/contrast as 7.5min topo to sat view. This provides side-by-side comparison (better to determine combined elevation/terrain of certain patterns that I like). However, it's best (IMO) in areas w/elevation changes that warrant the addition of the 7.5min topo ...and not as valuable in the flatlands.
Flat Terrain
  • In some of the river bottoms I hunt, they can go 5-10 feet under water fairly quickly. I tried, forever, to work w/the Arkansas GIS department to build a topo map w/3' contour intervals vs the standard 20' on a 7.5min topo. Finally, I found DEM [Digital Elevation Model] shading on Caltopo.By using this function, I can essentially create my own elevation map on 1meter (~3') intervals. The elevation changes are color coded.This is especially useful in knowing; do I need a boat, can I get through with knee boots, hip boots, chest waders, will this elevation support oak tree growth etc.
While Hunting
  • I use ONX while I'm hunting (lots of private inholdings on some of the public I hunt). Also, based on where I live in NE AR, I have access to several states w/in 1-3 hours (AL, AR, IL, KY, MO, MS, TN). Just upgraded onX ELITE for $59.99 (All 50 state sale via camofire this past week - May 16)
  • NOTE: If you are not hunting in an area where understanding property boundaries is critical, there are likely better options than onX IMO. This is my go to as I hunt mainly public w/private inholdings so knowing where I am at all times is critical.
Deal might still be going and perhaps I should have posted in the coupon/discount section
How do you get that shading on cal topo? Do you use that for any other fine tuning?
 

dpierce72

Well-Known Member
SH Member
Joined
Jan 13, 2018
Messages
615
Location
Arkansas
How do you get that shading on cal topo? Do you use that for any other fine tuning?
@Davis21 will you shoot me a PM? I'm not home now and it's something I know how to do, but can't explain w/out having the page open. I'll try to send the info.
 

dpierce72

Well-Known Member
SH Member
Joined
Jan 13, 2018
Messages
615
Location
Arkansas
Based on a few questions, I updated how I use Caltopo to determine elevation changes in river bottoms where a normal 7.5 minute topo will not help.

Also, referenced why HillMap is so valuable and how I use it. This thread has provided lots of great content. Thanks to all who have taken time to share. If you are interested in the DEM shading for elevation changes, see original post / blue font.
 

trogers449

New Member
Joined
Jan 16, 2019
Messages
7
I also use Cal topo and it is by far my favorite for desk top use. I use On X but share the frustrations others have mentioned. It is just very convenient when referencing access and boundaries. Another notable mention for mobile use that I didn’t notice in this thread is the Avenza maps phone app. You have to purchase maps but many of them are free or 1$.


Sent from my iPhone using Tapatalk
 

woodsdog2

Well-Known Member
SH Member
Joined
Jun 28, 2019
Messages
262
This is all great information gentlemen!!! It humbles me the depth and breadth of knowledge on this site. Thank you all for taking the time to share this stuff!!!!
 

dpierce72

Well-Known Member
SH Member
Joined
Jan 13, 2018
Messages
615
Location
Arkansas
For what it's worth, for flat land (specifically river bottom / flood prone) guys, I made another update to the original post.
 

GiGisDaddy

Active Member
SH Member
Joined
Dec 18, 2018
Messages
108
Location
Mississippi
Thank you... I have river bottoms and lowland that is hard to figure out....flooding wont happen until the end of February, need to see where the turkeys will be
 
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dpierce72

Well-Known Member
SH Member
Joined
Jan 13, 2018
Messages
615
Location
Arkansas
Dpierce, is there a way to copy DEM shading from Caltopo to onx on PC?
I have not tried that yet. Perhaps someone more tech savvy but I'm at about my max potential lol. If you figure it out, let me know and I'll consolidate it into the original thread!
 
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