How to… Create a basic transparent ‘Map’ img

[NeilP]

I have tried a couple of searches online but so far not found any good hits or tutorials on what I actually want. Guess that is because I am so new to this I am just not using the right search terms.

I was wanting to walk and create tracks and then have them appear on GPS screen. No need to be routable… though that would be cool.

The area has gutters between the rocks at low tide, which are good fishing spots to troll at mid tide when rocks are covered. If I could create and use those GPS tracks to create a map overlay of the area, so when out in kayak or small fishing boat at mid tide, I can follow those same gutters.

I wondered about drone photos of the area too, with key GPS points and then trace out in.. photoshop or similar ?

I live in a place with a tidal fall of over a mile of rocky low tide area, the picture is at about 16 foot tide height. When it drops to minimum it is out well beyond the tower, with a biggest high of 38-40 foot.

N 49 10.090
W 002 03.135


Where would I start on this please ?

Spoiler

IMG_4485.jpeg

[GPSrChive]

GPSrChive > How To... > Maps > Create IMG maps from GPX, GDB, KML and KMZ files would be a good starting point!

[NeilP]

Perfect
Thank you

[GPSrChive]

If none of those solutions get you the results you desire, let us know!

If they do, let us know!

[NeilP]

I will

have got small tides this week, but come end fo the month as the tides get bigger again I'll try walking some of the gutters at low tide to create some tracks

[GPSrChive]

Sounds like a fun project!

[NeilP]

This is just a first try ..but perfect exactly what i am after...

One track is an original gpx from many yeast ago , and another on top..yess all same colour , of my random paddling gout there in a kayak the other day.

Now I have the basics of it..I am going to have to start walking about out there at low tide.

thanks
Very much

oh ..and I worked out the "Spoiler" thing too!

Spoiler

test.img.zip

[NeilP]

I have had a degree of success, walking many of the gutters and marking higher rocks with Waypoints, and created a basic img file that I have then used on the Oregon 300 in the Kayak.

We have only had ‘nip’ tides, this week, where tide height is not higher than about 28 foot, or lower than 16. So no real low tides, so water has not gone out that far.

But it has brought home to me the difficulty of the task using this method.

Our local island government heritage site has a mapping and search site on line, and I can get LIDAR images of the area… but only via capturing screen grabs.


These show the gulleys and rock formations as per the screen shots I tiled together below.

Spoiler

4 shot.jpg

Tha was just x4 screen shots tiled inPhotoshop. If this works I can go back to the site and do a more detailed 3x3 or 4x4 grid of screenshots. The pic above is just 4 screen grab tiles.


Obviously no scale or other lat long or location data on it..just a JPEG.

I have not played with this yet, but i have once used QGIS to create contour map following this tutorial

Spoiler

https://equatorstudios.com/google-earth ... 20contours

So I know QGISis a powerful tool. but so far..I have not played with it with this project

Thinking along the lines of import the JPEG photo i have pulled from the LIDAR site, and trace the major tracks etc, and some how add 'data' location points ...

Is any of this possible ?

Basically what I am trying to achieve is a non routable "road map" "garmin gmapsupp.img type map to view when in the kayak, fishing , so i stay above the galleys.

As I say not tried yet and may find it intuitive one i get started, but just looking for hints or a " Just stop it now, not possible " comment...or even better...here..go to this site.......


Thanks


Neil

[NeilP]

Well I had a phone call from work..the buggers that pay my salary feel I ought to go in and do some work today

But I have tried the Equator studio contour map creation tutorial

Spoiler

https://equatorstudios.com/google-earth ... 20contours

but not data in that area. just shows land contours, not the below sea level contours.

The LIDAR image also attached is as good as it gets ..just need to some how now work out how use that.

Spoiler

Screenshot 2024-08-30 at 20.40.17.jpg

Screenshot 2024-08-31 at 09.01.56.jpg

Screenshot 2024-08-31 at 09.00.43.jpg

Screenshot 2024-08-31 at 09.00.23.jpg

[GPSrChive]

Working on a Saturday?

Bummer.

Just a quick question, do the available Garmin Marine maps not show the contours you want already?