搜索结果: 1-15 共查到“知识库 空间大地测量学”相关记录233条 . 查询时间(2.047 秒)
GIS辅助的室内定位技术研究进展
室内定位 室内GIS 位置服务
2020/3/19
室内定位技术是目前基于位置服务领域的研究热点之一，已引起政府部门、产业界和学术界的重视。室内GIS包含了丰富的先验知识，可用于辅助室内定位。本文对GIS辅助的室内定位技术需求、发展现状及面临的挑战进行了较系统梳理。首先介绍其发展现状，包括基于地图约束的室内定位、基于拓扑地图匹配的室内定位、基于语义感知的室内定位以及基于视觉感知的室内定位。随后，介绍了其面临的挑战，主要包括统一时空基准下的室内GIS...
时空索引是时空数据存储和管理的关键技术之一，基于空间填充曲线（space filling curve，SFC）的索引方法近年来受到了广泛关注。然而对于矢量数据，现有索引方法多侧重于空间索引的实现，难以同时顾及时间查询和空间查询的效率，且对于非点要素（线要素与面要素），确定最优的索引级别一直是难点所在。为此，本文面向对等网络环境，提出一种自适应层级的时空索引构建方法。首先提出了基于分区键和分区内排序...
GEOCONTEXT AND CHCONTEXT GEOGRAPHIC INFORMATION IN CULTURAL HERITAGE
cultural heritage web platforms code generation nterpreters geographic visualization geographic content
2018/11/8
Internet presence and applications are central for modern museums and cultural institutions. Even more it is important to facilitate and standardize the user experience in order to create a standard q...
SPATIOTEMPORAL DYNAMICS OF SURFACE WATER EXTENT FROM THREE DECADES OF SEASONALLY CONTINUOUS LANDSAT TIME SERIES AT SUBCONTINENTAL SCALE
Landsat time-series seasonally continuous surface water dynamics flooding dynamics Murray-Darling Basin Australia competing water demands drought random forest long term trends water river basin water management
2016/11/30
Surface water is a critical resource in semi-arid areas. The Murray-Darling Basin (MDB) of Australia, one of the largest semi-arid basins in the world is aiming to set a worldwide example of how to ba...
IMPACT OF LEVEL OF DETAILS IN THE 3D RECONSTRUCTION OF TREES FOR MICROCLIMATE MODELING
Urban climate Trees Terrestrial laser scanner Point cloud 3D reconstruction Leaves Evapotranspiration Level of details
2016/11/30
In the 21st century, urban areas undergo specific climatic conditions like urban heat islands which frequency and intensity increase over the years. Towards the understanding and the monitoring of the...
SPATIOTEMPORAL EVALUATION OF NOCTURNAL COLD AIR DRAINAGE OVER A SIMPLE SLOPE USING THERMAL INFRARED IMAGERY
Infrared camera Cold air drainage velocity Cooling rates Cold air pooling Microclimate Radiation frost
2016/11/30
Measurements of climatic processes such as cold air drainage flows are problematic over mountainous areas. Observation of cold air drainage is not available in the existing observation network and it ...
OBJECT-BASED IMAGE ANALYSIS BEYOND REMOTE SENSING–THE HUMAN PERSPECTIVE
OBIA GEOBIA GIScience place bona fide objects
2016/11/24
We introduce a prototypical methodological framework for a place-based GIS-RS system for the spatial delineation of place while incorporating spatial analysis and mapping techniques using methods from...
DOES THE DATA RESOLUTION/ORIGIN MATTER? SATELLITE,AIRBORNE AND UAV IMAGERY TO TACKLE PLANT INVASIONS
Detection Invasive species Mapping MSS imagery Object- and pixel-based classification Spectral spatial and temporal resolution
2016/11/24
Invasive plant species represent a serious threat to biodiversity and landscape as well as human health and socio-economy. To successfully fight plant invasions, new methods enabling fast and efficien...
MONITORING TREE POPULATION DYNAMICS IN ARID ZONE THROUGH MULTIPLE TEMPORAL SCALES:INTEGRATION OF SPATIAL ANALYSIS,CHANGE DETECTION AND FIELD LONG TERM MONITORING
Spatial analysis Change detection Long-term monitoring Arid Acacia trees Remote sensing
2016/11/23
High mortality rates and lack of recruitment in the acacia populations throughout the Negev Desert and the Arava rift valley of Israel have been reported in previous studies. However, it is difficult ...
PARALLEL IMPLEMENTATION OF MORPHOLOGICAL PROFILE BASED SPECTRAL-SPATIAL CLASSIFICATION SCHEME FOR HYPERSPECTRAL IMAGERY
Hyperspectral Extended Morphological Profile (EMP) spectral-spatial classification parallel processing GPU
2016/11/23
Extended morphological profile (EMP) is a good technique for extracting spectral-spatial information from the images but large size of hyperspectral images is an important concern for creating EMPs. H...
Accuracy of Digital Elevation Model according to spatial resolution
Accuracy Digital Elevation Model according spatial resolution
2016/5/23
Digital Elevation Model (DEM) is indispensable for many analyses such as topographic feature extraction, runoff analysis, slope stability analysis and so on. Beforehand such analyses, accuracy of DEM ...
Contributions to a quality description of areal objects in spatial data sets
spatial data quality comparison of spatial entities building extraction
2016/5/20
In this paper we present a quality evaluation of two-dimensional building acquisition. We propose methods for identification and quantifi-cation of differences between independently acquired regions, ...
The determination of the spatial extent of geo-objects is generally approached through the boundaries or more precisely through the position of the boundary points. The analysis of the geometric uncer...
When we map an area or create a digital database for it, the first task is often to partition the space into smaller units.There are traditionally two methods of partition called vector and raster. A ...
Integrated use of spatial data and learning algorithms to detect water quality trends
Integrated spatial data learning algorithms detect water quality trends
2016/5/20
This paper presents the first results of a study which investigates river basin water quality management based on the ability of GIS to integrate different data sources into a common geographical data...