排序方式： 共有46条查询结果，搜索用时 17 毫秒
31.
32.
33.
CorelDraw软件作为出版界认可的高质量通用绘图软件,具有人机交互能力强、速度快、占用硬件资源少等多种优点,在地质界也已被广泛应用.但应用CorelDraw软件在绘制地质柱状图时,只能手工绘制,而不能用批量数据直接成图,影响了地质研究的工作效率.本文应用VB对CorelDraw软件进行少量简单的编码,快速解决了这一相对复杂的问题.不仅加强了CorelDraw软件的自动绘图功能,而且提高了地质柱状图的绘制效率和精度,为绘制基于柱状图的各种复杂地质图件,尤其是绘制地质剖面图提供了高效易行的手段. 相似文献
34.
DEM matching is a technique to match two surfaces or two DEMs, at different reference frames. It was originally proposed to replace the need of ground control points for absolute orientation of perspective images. This paper examines DEM matching for precise mapping of pushbroom images without ground control points. We proved that DEM matching based on 3D similarity transformation can be used when model errors are only on the platform’s position and attitude biases. We also proposed how to estimate bias errors and how to update rigorous pushbroom sensor models from DEM matching results. We used a SPOT-5 stereo pair at ground sampling distance of 2.5 m and a reference DEM dataset at grid spacing of 30 m and showed that rigorous pushbroom models with accuracy better than twice of the ground sampling distance both in image and object space have been achieved through DEM matching. We showed further that DEM matching based on 3D similarity transformation may not work for pushbroom images with drift or drift rate errors. We discussed the effects of DEM outliers on DEM matching and automated removal of outliers. The major contribution of this paper is that we validate DEM matching, theoretically and experimentally, for estimating position and attitude biases and for establishing rigorous sensor models for pushbroom images. 相似文献
35.
36.
Angelos Tzotsos Konstantinos Karantzalos Demetre Argialas 《ISPRS Journal of Photogrammetry and Remote Sensing》2011,66(1):2-16
In this research, an object-oriented image classification framework was developed which incorporates nonlinear scale-space filtering into the multi-scale segmentation and classification procedures. Morphological levelings, which possess a number of desired spatial and spectral properties, were associated with anisotropically diffused markers towards the construction of nonlinear scale spaces. Image objects were computed at various scales and were connected to a kernel-based learning machine for the classification of various earth-observation data from both active and passive remote sensing sensors. Unlike previous object-based image analysis approaches, the scale hierarchy is implicitly derived from scale-space representation properties. The developed approach does not require the tuning of any parameter—of those which control the multi-scale segmentation and object extraction procedure, like shape, color, texture, etc. The developed object-oriented image classification framework was applied on a number of remote sensing data from different airborne and spaceborne sensors including SAR images, high and very high resolution panchromatic and multispectral aerial and satellite datasets. The very promising experimental results along with the performed qualitative and quantitative evaluation demonstrate the potential of the proposed approach. 相似文献
37.
VB在基于AutoCAD的数字测图系统开发中的应用 总被引：1，自引：0，他引：1
本文通过具体的几个实例较详细地介绍了如何应用VB开发基于AutoCAD的数字测图系统 ,说明利用VB开发AutoCAD要比用其它方法简单、方便 ,且能实现功能较强的数字测图系统。 相似文献
38.
39.
We introduce a new automated approach to parameterising multi-scale image segmentation of multiple layers, and we implemented it as a generic tool for the eCognition® software. This approach relies on the potential of the local variance (LV) to detect scale transitions in geospatial data. The tool detects the number of layers added to a project and segments them iteratively with a multiresolution segmentation algorithm in a bottom-up approach, where the scale factor in the segmentation, namely, the scale parameter (SP), increases with a constant increment. The average LV value of the objects in all of the layers is computed and serves as a condition for stopping the iterations: when a scale level records an LV value that is equal to or lower than the previous value, the iteration ends, and the objects segmented in the previous level are retained. Three orders of magnitude of SP lags produce a corresponding number of scale levels. Tests on very high resolution imagery provided satisfactory results for generic applicability. The tool has a significant potential for enabling objectivity and automation of GEOBIA analysis. 相似文献
40.
Automation技术是一种新型的数据访问技术,它提供了一种不同模块之间相互操作的方法。Surfer Automation是基于Surfer软件的Automation技术,可以实现Surfer面向对象编程语言的二次开发。这里以柴达木盆地尕斯库勒油田上盘为例,运用Surfer Automation技术及其与VB编程语言的接口,结合地质认识进行参数调整,选取合理的数学方法,批量自动化建立了各种用于油藏描述的地质模型,提高了长井段油藏的建模效率,且避免了一些人为因素导致的误差,为油藏精细描述带来了便利。 相似文献