[HOT] hotosm-task#711-Kayes: "black spots = pools of water"

S Volk svolk2 at hotmail.com
Wed Oct 29 15:18:46 UTC 2014

Sorry, thanks Charlotte,not poll: meant "pool", as in the subject, Actually I pointed what I think are some man-made reservoirs and water well.Natural pool left by rain I didn't marked nor saw. Only saw it in the "wadi" intermittent waterway, but saw it marked as wadi line.Sorry for bad english againBest wishes,Sergio
Date: Wed, 29 Oct 2014 07:56:37 -0700
To: svolk2 at hotmail.com
From: techlady at techlady.com
Subject: Re: [HOT] hotosm-task#711-Kayes: "black spots = pools of water"


        What's a
"poll"? Usually that means an opinion survey. Do you mean



At 11:27 PM 10/28/2014, you wrote:

Hi people mapping Kayes, 

please, one question on what is said in #hotosm-task-711 (Kayes/Mali)

"black spots correspond to pools of


I'm not sure if I'm beginning to understand well the peculiar pattern of
features there, I ask you if can confirm.

I haven't seen truly black spots as mentioned, in this area I show. May
you have an satellite image of that mentioned black spot to publicize?

Are these rounded things wells, or polls, (mostly public), or none of

Its all here:


What I think it is:

1-On the left and above on the screen shown, there is what seems some
round huts in dark color: they seem brown, with shadows bigger than
ground and fences, to the side above the ground (hut, if they are closed
with walls, or a shelter if open, but can't know if open or closed to be
specifically tagged). Besides there seems to be fences since are very
irregular, not straight, but it could be walls; perhaps more probably
walls of bricks, since shows no light failures through its shadows, mud

2-In the central common/public place, there are two rounded shapes,
around 1 and 2m diameter, both with shadows of walls seeming to be above
the ground. The one with 1m seems dark in inner side, so deeper than
ground, so looks like a public well. The one with 2m seems bright in
innner side, so in the level of ground or almost. So looks like a public
reservoir, like a pool but with small walls. Some like one spot in
extreme right, with bright color in inner side, around 1m diameter, seems
to have walls above the ground, seems it also can be a well.

3-Other, like the one brown to right, is around 4-5m wide, same widht of
others that seemed to be huts. Seems have no shadow of walls above the
ground, only to downside, so seems a pool, or some kind of small

I guess now maybe I'm realising a patterns around: 

I only saw before what seemed to be high and closed water
constructions  around 2m wide and almost on the level of roofs.

The rest I thought it was fences (for small animals like goats, chicken;
perhaps there are).

But now I think almost every house seems having an open reservoir
squared 1-2m side, with small walls above the ground (shadows not longer
than fences) to people can get to

Don't know if is much important to know this. Only to report, if

Not to complicate, are these two basic features of water_well and
reservoir (pools) differently? 

Is there a tag for such kind of small reservoirs?

(Reservoir is by now only for big tag:landuse=reservoir. Also seems not a
typical pond on ground level.)


>> So it seems there is a basic pattern of at least 3
constructions for each allotment: 

houses around over 3x6m, closed squared high water tank, and open
reservoir on ground level 1-2m wide (few 4m), almost squared or

And on common areas some public water-well (but one well shown here seems
particular), together with reservoir on ground level for eventual water
delivery by truck, and reservoir below ground level to colect rain

Can this be confirmed? Is this a pattern? Are those the mentioned
pools (reservoir), and about high water tank, etc., is there propper

Thanks. Sorry for bad english.

For anything, contact me.



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Charlotte Wolter

927 18th Street Suite A

Santa Monica, California



techlady at techlady.com

Skype: thetechlady

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