搜索结果: 1-10 共查到“工学 Cropland”相关记录10条 . 查询时间(0.109 秒)
A COMPARATIVE ANALYSIS OF FIVE CROPLAND DATASETS IN AFRICA
Africa Land cover Cropland area Spatial location Accuracy
2018/5/15
The food security, particularly in Africa, is a challenge to be resolved. The cropland area and spatial distribution obtained from remote sensing imagery are vital information. In this paper, accordin...
ESTIMATING GROSS PRIMARY PRODUCTION IN CROPLAND WITH HIGH SPATIAL AND TEMPORAL SCALE REMOTE SENSING DATA
Cropland GOES-13 geostationary Gross Primary Production Landsat NDV MODIS NDVI/EVI product carbon cycle Photosynthesis active radiation (PAR)
2018/5/15
Satellite remote sensing data provide spatially continuous and temporally repetitive observations of land surfaces, and they have become increasingly important for monitoring large region of vegetatio...
VARIATIONS IN CROPLAND PHENOLOGY IN CHINA FROM 1983 TO 2002
Cropland phenology Starting date of growing season (SGS) NDVI Variation China
2016/1/3
In this study, we used the NDVI time-series datasets to investigate variations in the starting dates of growing season (SGS) in China's cropland from 1983 to 2002. To do so, a smoothing algorithm base...
Enhancing the Automatic Verification of Cropland in IKONOS Imagery
Segmentation Grouping Image Understanding Feature Extraction
2015/12/16
Segmentation is one of the first steps in the field of image analyzing and image understanding. It is the basis for the interpretation of images, or it supports other techniques which is the motivatio...
New methods and satellites: A program update on the NASS cropland data layer and acreage program
AWiFS Landsat See5
2015/9/6
The United States Department of Agriculture (USDA), National Agricultural Statistics Service (NASS) annually produces crop
specific classifications and acreage estimates over the major growing region...
COST AND BENEFIT ANALYSIS OF A CROPLAND DATA LAYER
Agricultural statistics service farmland data geographic information system the monitoring of the basin agricultural planning prairie pothole water monitoring crop and animal habitats
2015/5/13
In the last several years, the National Agricultural Statistics Service (NASS) has developed a Cropland Data
Layer (CDL) in geographic information system (GIS) format (See Figure 1) for public use. ...
MULTITEMPORAL QUALITY ASSESSMENT OF GRASSLAND AND CROPLAND OBJECTS OF A TOPOGRAPHIC DATASET
Automation Quality Inspection Updating GIS Crop Multitemporal Classification
2014/4/28
As a consequence of the wide-spread application of digital geo-data in geographic information systems (GIS), quality control has
become increasingly important to enhance the usefulness of the data. ...
Comparing the impact of cloudiness on carbon dioxide exchange in a grassland and a maize cropland in northwestern China
Clearness index Diffuse radiation NEE Photosynthetically active radiation (PAR)
2013/9/2
Light quantity and quality strongly influence plant growth. However, different ecosystems have different capabilities to assimilate solar radiation. In this study, the effects of cloudiness intensity ...
POTENTIAL EVALUATION OF DIFFERENT TYPES OF IMAGES AND THEIR COMBINATION FOR THE CLASSIFICATION OF GIS OBJECTS CROPLAND AND GRASSLAND
Agriculture Classification Multitemporal Aeria Satellite
2014/6/5
In many publications the performance of different classification algorithms regarding to agricultural classes is evaluated.
In contrast, this paper focuses on the potential of different imagery for ...
黄土区农草混合利用坡面土壤水分空间变异性（Spatial Variability of Soil Water Content on a Cropland-grassland Mixed Slope Land in the Loess Plateau, China）
土壤水分 农草混合结构 空间变异性
2010/12/29
通过对黄土区农草混合利用坡面的土壤水分分析，研究土地利用结构对土壤水分空间变异特性的影响。结果表明，研究区坡面土壤水分呈中等变异，且农草混合利用结构明显增加了土壤水分的空间变异强度，坡面土壤水分具有明显空间结构性。干湿条件下坡面0～60cm土层平均含水率的半方差最优理论模型分别为高斯模型和球状模型，且干旱条件较湿润条件下保持较高的基台值和变程，而块金值/基台值相对较低。Kriging插值结果显示...