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ISPRS International Journal of Geo-Information, Volume 6, Issue 10

October 2017 - 29 articles

Cover Story: We investigated groundwater nitrate contamination in the Central Valley aquifer, California, USA, in relation to the source variables, aquifer characteristics, and geochemical conditions using three different statistical methods: Geodetector (GED), Principal Component Analysis (PCA) and Geographically Weighted Regression (GWR). Our comparative analysis of the three methods showed that GED was more advantageous, because it was less restrictive on input data, its output was more intuitive to interpret, and it captured all aspects of what the other two methods did. GED detected precipitation, fertilizer, manure, elevation, and clay as significant variables in controlling the spatial distribution of groundwater contamination in the Central Valley aquifer. San Joaquin Basin and Tulare Basin were identified as vulnerable regions with a higher percent of wells containing above 5 mg/L of nitrate. View the paper
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Articles (29)

  • Article
  • Open Access
12 Citations
6,736 Views
22 Pages

Reliable water surface extraction is essential for river delineation and flood monitoring. Obtaining such information from fine resolution satellite imagery has attracted much interest for geographic and remote sensing applications. However, those im...

  • Article
  • Open Access
7 Citations
5,595 Views
24 Pages

On Metrics for Location-Aware Games

  • Luis E. Rodríguez-Pupo,
  • Sven Casteleyn and
  • Carlos Granell

Metrics are important and well-known tools to measure users’ behavior in games, and gameplay in general. Particularities of location-aware games—a class of games where the player’s location plays a central role-demand specific support in metrics to a...

  • Article
  • Open Access
64 Citations
10,140 Views
25 Pages

Groundwater nitrate contamination in the Central Valley (CV) aquifer of California is a ubiquitous groundwater problem found in various parts of the valley. Heavy irrigation and application of fertilizer over the last several decades have caused grou...

  • Article
  • Open Access
14 Citations
6,642 Views
27 Pages

We analyze the importance of riparian ecosystems (RE) as critical areas for carbon storage and productivity in semi-arid regions of Northwest Mexico. We calculated the carbon storage by land cover and compared temporal trends of basal productivity (M...

  • Article
  • Open Access
22 Citations
8,986 Views
15 Pages

Spatial point pattern analysis is commonly used in ecology to examine the spatial distribution of individual organisms or events, which may shed light on the operation of underlying ecological processes driving the development of a spatial pattern. C...

  • Article
  • Open Access
28 Citations
7,479 Views
13 Pages

Street systems are the backbone of cities. With global urbanization and economic development, street systems have undergone significant development along with the growth of cities. In this paper, the authors select three cities with varying sizes, hi...

  • Article
  • Open Access
27 Citations
9,248 Views
14 Pages

Time series land cover maps play a key role in monitoring the dynamic change of land use. To obtain classification maps with better spatial-temporal consistency and classification accuracy, this study used an algorithm that incorporated information f...

  • Article
  • Open Access
5 Citations
7,000 Views
14 Pages

Across Europe, and probably the world, messages of the extreme right surface with increasing and alarming regularity in both public and virtual space. Within the virtual space, geomedia are increasingly used in nationalist propaganda, a trend which i...

  • Article
  • Open Access
8 Citations
6,601 Views
11 Pages

In this work, we combine SAR and optical images for geo-hazard detection and monitoring in Western China. An extremely small baseline of C-band SAR image pairs acquired from Sentinel-1A at Menyuan, China, is analyzed. Apart from the large area of cos...

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ISPRS Int. J. Geo-Inf. - ISSN 2220-9964