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Crop planting area is significant to agricultural structure adjustment and regional food balance policy. Based on field investigation and spectral property analysis of corn in HJ1-CCD images, different threshold configurations are set to build decision trees and corn planting area is precisely extracted utilizing multi-temporal HJ-1 CCD images in Zhecheng county, Henan Province of China. Both statistical...
Guam, USA has been facing drastic landscape change since World War II, especially when President John F. Kennedy lifted the Naval Clearing Act which opened Guam's ports to domestic and foreign visitors in 1962. Extensive construction activities in 1970s and 1980s changed the land cover in Guam, particularly the central and northern parts of Guam a lot. This research is focused on determination of...
With the development of Voronoi theory and algorithm, more and more attention was paid in the application of Voronoi in Cartography. In this paper, Voronoi Diagram and its applications were briefly introduced at first. Then the author focused on its applications in Cartography from the identification and extraction of map information, map generalization, automatic name placement and other aspects...
A decision tree is an analysis skill and a classification algorithm, whose basic principle is the combination of probability theory and an analysis tool of tree shapes. It derives a hierarchy of partition rules with respect to a target attribute of a large dataset. Nowadays, concrete coordinates exist in lots of datasets, which leads to the spatial distribution of datasets. However, conventional decision...
LIDAR (Light Detection and Ranging) is one of the most effective remote sensing systems, which could provide three dimensional information of earth surface with high accuracy and speed. Now the building boundary extraction is the key approach for 3D modeling of building and city mapping. In this paper, a new algorithm named Alpha Shapes is developed to extract the building boundary. Compared with...
By allowing the estimation of forest structural and biophysical characteristics at different temporal and spatial scales, remote sensing may contribute to our understanding and monitoring of planted forests. In this paper, we used multi-temporal data from Landsat TM to investigate 9-year time-series of the Normalized Difference Vegetation Index (NDVI) in Dongying city, Shandong province, China. According...
During past decades, land use and land cover change detection techniques have undergone substantial development. However, different scenarios and an integrated workflow linking remote sensing imagery and GIS are often neglected. As a result, we develop a land use and land cover change detection and extraction system and propose five scenarios considering data availability and different classification...
Along with the rapid development of computer technology, the construction of geographic information Digitizing has already entered the superheating stage increasingly. In order to seek the knowledge of geographical environment accurately and profoundly, the idea of conventional geographic information query merges the user service logic of query with code, however, which can hardly separate the service...
Because different types of ground objects have different spatial and spectrum characteristics, automatic and accurate extraction of different thematic objects from remote sensing without spatial conflict and topology conflict is still a challenge. The design of special thematic intelligent Agents to recognize special objects in high-resolution remote sensing images is useful for object extraction...
Sea surface temperature is one of very important environmental parameters. Clear and cloudless MODIS data during each month in 2010 were taken as data sources. Pre-processions such as bowtie correction, geometric correction, and image resize were performed accordingly. Then, spatial distribution information of sea surface temperature in every month, 2010 was extracted by applying nonlinear sea surface...
Geographic information retrieval (GIR) is developed to retrieve geographical information from unstructured text (commonly web documents). Previous researches focus on applying traditional information retrieval (IR) techniques to GIR, such as ranking geographic relevance by vector space model (VSM). In many cases, these keyword-based methods can not support spatial query very well. For example, searching...
The integration of heterogeneous multi-source geospatial information always has been the research focus of geographic information sharing. As an efficient tool to describe, discover and retrieve the information source, metadata is the key technology the implement the integration and sharing of information sources. Metadata directory service is to describe various information use metadata as the basic...
In order to coordinate and integrate management of reclaimed and un-reclaimed land in the mining area, easy to search, query, statistics, analysis, and maintain the reality of land reclamation. Based on the software engineering, this paper analyses the overall structure of land reclamation management information system and some key issues in the process of building land reclamation management information...
This study selected aquatic vegetation in BaiYangDian Wetland Nature Reserve in Hebei Province. Measuring the spectral reflectance of typical aquatic vegetation included stonewort, reed, lotus and typha, involved high-resolution GeoEye-1(GE) remote sensing image, based on spectral reflectance of different species simulating bands of GE, calculated the simulated bands, educed better bands or band combinations...
A multifractal based approach to extracting road information is presented in this paper. As a case study, a Geoeye-1 image is used for the experiment. The result is compared with the results from Sobel operator, Roberts operator, Prewitt operator. It is shown that the proposed multifractal based method can extract different types of road information more effectively.
In this paper, we put forward an approach to extract water-body in remote sensing image using logic operation defined by ourselves. In order to use this method to extract water-body, firstly, NDVI was calculated from multi-spectral image, and vegetation was removed by a certain threshold; Secondly, artificial buildings, cultivated land, cloud, and bare land were extracted according to the spectral...
The spatial pattern of prehistoric settlement sites in Henan Province is researched. By analyzing the relationship between prehistoric settlement sites location and regional altitude, terrain slope, rivers and other geographical environment factors, the laws of the distribution of prehistoric settlement sites are found: more than 70% of settlement sites are located at the altitude of from 50 to 400...
The precision of road damage detection in disaster area from high resolution remote sensing images is general low because the current methods are mainly based on pixels and can't combine with the already existing GIS information. This paper presents an object-oriented road damage detection method. First and foremost, Multi-scale segmentation technology is adopted to get image objects, and then the...
With industrialization process rapidly speeding up in our country and the dramatically growing of demands about mine development, people pay more attention to reasonably explore and effectively make use of mine resource, so it is priority to research the construction of digital mine. If data warehouse technology has been applied to the present mining industry, a new perspective to the analysis of...
A new technique for quickly assessing extensive areas of mining subsidence that uses digital elevation models (DEMs) extracted from LiDAR (Airborne light detection and ranging, LiDAR) is presented in this paper. The proposed technique observes the elevation changes by using multi-temporal DEMs. One-meter-resolution DEMs from LiDAR data are applied to detection the mining subsidence in Hebi coal mine...
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