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Re: Contouring data over maps [message #12438 is a reply to message #12433]

Wed, 05 August 1998 00:00

Jason Hasenbuhler
Messages: 2
Registered: August 1998

Junior Member

Unfortunately, I'm not contouring depth. I'm
contouring things like light asorbance/
transmittance, salinity, and temperature. If
I assume the land points to be 0, extreme
negatives, or extreme positives - I still
slant the data. My data points are structured
as follows:

I have 1 file for each lat/long location that
measurements were taken at. This file
contains ~ 100 to 400 readings made by
equipment lowered overboard, and are
organized by the number of seconds since the
recording was started.

My program currently gets an average of these
values over a depth-range and then contours
the averages.

Files that do not have values inside the requested depth-
range are not used at all in the contour.

Hmm...to slightly modify that idea, maybe if I could figure
out a way to determine if a given grid point was inside or
outside of the land, I could then "fill-in" all the gridpoints
inside land with the nearest ocean value. This might be
expensive time-wise, but it should give good results. Does
anyone know how I could determine if a point is on the
ocean or on the land? I'm using the built-in IDL maps..

Thanks,

Jason Hasenbuhler
hasenbuh@rex.cs.tulane.edu

BTW: Thanks for your help everyone, this problem is turning
into quite a hair-puller.

R.J. Hall wrote:

> Just a thought, and maybe completely wrong, but ...
>
> At the coastline, water depth is zero. The coastline location
> is known, so you have additional data points = 0
> This would (hopefuly) create a 0 contour line = coastline, when
> contour is run.
> The result would produce the required contour map with
> respect to the coastline.
>
> I would appreciate any comments on this.
>
> Many thanks
> Richard
>

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[Message index]

		Re: Contouring data over maps By: wmc on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: Jason Hasenbuhler on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: rjh55 on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: rmlongfield on Wed, 05 August 1998 00:00
		Re: Contouring data over maps By: Jason Hasenbuhler on Tue, 04 August 1998 00:00
		Re: Contouring data over maps By: wmc on Tue, 04 August 1998 00:00
		Re: Contouring data over maps By: davidf on Mon, 03 August 1998 00:00

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