In this study, the concentrations of heavy metals (Ca, Zn, Cu, Fe, Mn, Ni) in thesediment of Shavoor River in Khuzestan Province in Iran has been investigated. After the library studies and field studies, six samples of water and sediment were taken from the river in order to evaluate heavy metal pollution in sediments. To determine the geochemical phases of metals in sediment samples the 5-ste...

In this paper we present the Edinburgh Geo-annotator, a web-based annotation tool for the manual geo-resolution of location mentions in text using a gazetteer. The annotation tool has an interlinked text and map interface which lets annotators pick correct candidates within the gazetteer more easily. The geo-annotator can be used to correct the output of a geoparser or to create gold standard g...

This research aimed at assessment of the levels, speciation, risk indices and seasonal variation heavy metals (Cd Cu) in water sediments from Hunki Ox-bow Lake Awe L.G.A Nasarawa State, using Atomic Absorption Spectrophotometer (AAS), during dry wet seasons. The mean concentration Cd samples both seasons was higher than that Cu, but Cu on whole (raw) sediment samples. baseline levels (mg/L) wer...

The high data availability and the increasing number of GIS users have motivated the emergence of distributed algorithms to process spatial operations efficiently. They are based on distributed indexes for an high performance processing. Researches and ongoing work use R-trees as a distributed spatial structure for indexing and retrieval of geo objects. However, these indexes have shown a chall...

Geographical phenomena fall into two categories: scaleful and scale-free phenomena. The former bears characteristic scales, the latter has no scale. conventional quantitative mathematical methods can only be effectively applied to geographical rather than In this paper, a comparison between systems are drawn by means of simple models. main viewpoints as below. First, researched methods, while s...