Hi Shafiuddin Ahmed,

I suggest the QGIS software for the elaboration of thematic maps, in your case, of distribution of metals in an area.

QGIS (formerly known as Quantum GIS) is open source/cross-platform software that provides visualization, editing and analysis of georeferenced data.

QGIS allows the user to create multi-layered maps using different projections.

I use this software a lot for relief analysis, such as terrain profile, areas of visibility, declivity, etc.

I did not quite understand exactly what the application would be, but how Ocean Data View (ODV) is a software for the interactive exploration, analysis and visualization of oceanographic and other geo-referenced data, I think QGIS will perform that pretty well.

This is the link for QGIS download:

https://download.qgis.org/

QGIS software

Hi lindro.. I have used qgis and i know it is abslolute free. However, u will be very greatful to you to share any link or article to show the the special distribution osf metal concentration along a river in a map. Thank you again sir..

I assume you have a set of observations (samples collected in a water body) as points (longitude, latitude) and the respective concentration value of a given metal.

You can create the spatial distribution from these samples using an interpolation technique. There are several techniques, but for your case, I suggest Inverse Distance Weighting (IDW) or Kriging Interpolation.

The IDW is easier, however, I consider Kriging statistically better because it allows identifying distortions in the data, i.e., possible errors on the observations throughout the variance output.

Follow the link below for the tutoring of these two tools:

QGIS - create IDW interpolation: https://www.youtube.com/watch?v=AljVt8tjhVM

QGIS kriging interpolation: https://www.youtube.com/watch?v=0OpMp9r6frs

i will follow your..thank you leandro for helping..

Agree with Leandro França .

IF you have access to ArcGis, Surfer etc you can interpolate in these software also