This paper presents an analysis of four open-source Global Digital Elevation Models (GDEMs) and compares them on two topographic profiles (nearly flat, hills regions) for mapping geomatics applications. The chief intention is to investigate if GDEMs-based heights, contour intervals, slopes, are valid all map scales mapping, which constitutes a major issue in activities. Two case studies, the Ni...

soil erosion is a serious environmental problem in vazroud watershed, which is located in the centre of the mazandaran province, iran. unfortunately, vazroud watershed like most iran watersheds don’t have recorded data and erosion and sedimentation gages to research, monitor and model soil erosion at large watershed. in order to assess the soil erosion risk, soil erosion modeling at the watersh...

We present an 850μm map and list of candidate sources in a sub-area of the Groth Strip observed using SCUBA. The map consists of a long strip of adjoining jigglemaps covering the southwestern 70 arcmin of the original WFPC2 Groth Strip to an average 1 σ rms noise level of ≃ 3.5mJy. We initially detect 7 candidate sources with signal-to-noise ratios (SNRs) between 3.0 and 3.5 σ and 4 candidate s...

We propose a novel resource allocation scheme, which can reduce MAP overhead and maximize the throughput in the MIMO-OFDM systems. In the message based broadband access system, we need to minimize the MAP overhead since the excessive MAP overhead causes degradation of system throughput. Increasing the size of resource allocation unit can reduce MAP overhead. However, multiuser diversity gain be...

A novel method to compute the clarity map from single image based on the local maxima and minima information inside image is proposed in this paper. The well-focused region can be easily identified according to the significant pixels inside the clarity map of image. Our method utilizes the clarity map difference between two source images as the focus criteria to implement multi-focus image fusi...

This paper is concerned with the problem of odor source localization using multi-robot system. A learning particle swarm optimization algorithm, which can coordinate a multi-robot system to locate the odor source, is proposed. First, in order to develop the proposed algorithm, a source probability map for a robot is built and updated by using concentration magnitude information, wind informatio...

Is cognition of geographic space affected by the source from which the knowledge is acquired (i.e., map, navigation, verbal description, etc.)? Studies have shown that it is and that these effects may be the result of the source, source content, or sensory mode, amongst other potential causes. If cognition of geographic space is affected by the source from which the information is acquired then...