Bass Strait Warning

Keep up-to-date about what's happening with the Scuba Doctor's Melbourne and Victorian dive maps and dive site information.
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lloyd_borrett
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Bass Strait Warning

Postby lloyd_borrett » Fri, 26 Feb 2021 8:22 pm

G'day,

I've enhanced the Bass Strait Warning information and started to apply it to more dive sites.

See https://www.scubadoctor.com.au/divesite.htm?site=Casino for an example.

It's still a work in progress, so if you spot a dive site where you think the warning needs to be added, please let me know.

Best regards, Lloyd Borrett.



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packo
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Re: Bass Strait Warning

Postby packo » Sun, 11 Apr 2021 11:56 am

Hello,

Not sure if this post really belongs in this thread, but it all started when I clicked on Lloyd's link to the Casino Wreck dive site page from his post above. Initially this was to read the new "Bass Strait Warnings" text. This seems a worthwhile thing to do.

My attention then drifted to the other new feature of "a direct zoom to a google map" image of the dive site. I have some shortcomings about present implementation of this feature because in some cases the specified "zoom level" is too high and google does not have aerial imagery for that level. Even where this is not the case, looking at a highly magnified sea surface with a central dive type icon is not that informative.

Ideally (but probably very hard to code!) the zoom level should set so we have either:-
1) The map includes the nearest neighbour dive site
or
2) The map includes the nearest part of a coastline/island etc.

I can't see that this would either be easy or possible, so I guess it will be up to the user to keep on "zooming out" manually until 1) or 2) are met.

Practising this on the insert map for the Casino wreck dive site, I was astonished to see that as I zoomed out, a "wreck like" shadow appeared some distance northeast of Lloyd's wreck icon.

Sure enough looking at the map scale it seemed this dark shape on the seabed was roughly 200m away in a northeast direction from the coordinates as marked by the wreck icon. This is a reasonably certain tell-tale sign the ScubaDoc coords are to the old ADG66 datum and not WGS84 as claimed.

I cobbled together the image below to make the case for a correction.
Image

cheers,
packo



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lloyd_borrett
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Re: Bass Strait Warning

Postby lloyd_borrett » Mon, 12 Apr 2021 9:44 am

Thanks Packo,

I've made the correction for the Casino as you suggested.

Best regards, Lloyd Borrett.



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lloyd_borrett
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Re: Bass Strait Warning

Postby lloyd_borrett » Tue, 13 Apr 2021 8:21 pm

packo wrote:My attention then drifted to the other new feature of "a direct zoom to a google map" image of the dive site. I have some shortcomings about the present implementation of this feature because in some cases the specified "zoom level" is too high and google does not have aerial imagery for that level. Even where this is not the case, looking at a highly magnified sea surface with a central dive type icon is not that informative.

Ideally (but probably very hard to code!) the zoom level should set so we have either:-
1) The map includes the nearest neighbour dive site
or
2) The map includes the nearest part of a coastline/island etc.

I can't see that this would either be easy or possible, so I guess it will be up to the user to keep on "zooming out" manually until 1) or 2) are met.


Sadly, it doesn't seem possible to solve the problem of it being zoomed in too far for some sites such that aerial imagery isn't available. I am looking into how the default is zoomed out a bit more.

Best regards, Lloyd Borrett.



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lloyd_borrett
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Re: Bass Strait Warning

Postby lloyd_borrett » Wed, 14 Apr 2021 9:34 pm

G'day,

Success! I've found where the zoom level is set and adjusted it for a better result on the dive site location maps. Sometimes it's the little things that count.

Best regards, Lloyd Borrett.




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