目前各个安全厂商都开始积极地挖掘情报数据的价值，研究威胁情报分析与共享技术。越来越多的安全厂商开始提供威胁情报服务，众多企业的安全应急响应中心也开始接收威胁情报，威胁情报的受重视程度日益变高。根据SANS 发布的全球企业的威胁情报调查报告（The SANS State of Cyber Threat Intelligence Survey: CTI Important and Maturing），94% 的受访企业表示目前已有威胁情报项目，70% 企业采了用威胁情报供应商的商业源。
这篇文章主要为大家详细介绍了网站防盗链的设置方法介绍(适用于IIS和Apache)，具有一定的参考价值，感兴趣的小伙伴们可以参考一下,有需要的朋友可以收藏方便以后借鉴。
在网站域名屡次被撤销之后， Sci-Hub 创始人 Alexandra Elbakyan 在分布式域名网络 Handshake 上注册了新的网站。
Donuts17个后缀上新 日前，备受域名行业推崇的.games、.fan、.news、.cafe等17个Donuts旗下顶级域名正式登录腾讯。域名注册者可通过腾讯注册、续费上述17个顶级域名。 2020年8月11日，Donuts旗下： “.BAND”“.CAB”“.CAFE”“.CASH”“.FAN”“.FYI”“.GAMES”“.MARKET”“.MBA”“.MEDIA”“.NEWS”“.SALE”“.SHOPPING”“.STUDIO”“.TAX”“.TECHNOLOGY”“.VIN”等1
Landsat 7 Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
The MCD43A1 V6 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Model Parameters dataset is a 500 meter daily 16-day product. The Julian date represents the 9th day of the 16-day retrieval period, and consequently the observations are weighted to estimate the BRDF/Albedo for that day. The MCD43A1 algorithm, as is with all combined products, chooses the best representative pixel from a pool that includes all the acquisitions from both the Terra and Aqua sensors from the retrieval period.
The MCD43A3 V6 Albedo Model dataset is a daily 16-day product. It provides both directional hemispherical reflectance (black sky albedo) and bihemispherical reflectance (white sky albedo) for each of the MODIS surface reflectance bands (band 1 through band 7) as well as 3 broad spectrum bands (visible, near infrared, and shortwave). Each 500m/pixel daily image is generated using 16 days of data, centered on the given day. A quality band is also provided for each of the 10 albedo bands.
Landsat 7 Collection 1 Tier 1 and Real-Time data DN values, representing scaled, calibrated at-sensor radiance.
The MCD43A2 V6 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Quality dataset is a 500 meter daily 16-day product. It contains all the quality information for the corresponding 16-day MCD43A3 Albedo and the MCD43A4 Nadir-BRDF (NBAR) products.
这个问题已经是去年提出的了，之前也看到过，在 CTF 题目环境中利用过却对原理不慎了解，在公司大佬们的帮助下成功了理解了一波原理。
Landsat 7 Collection 1 Tier 1 calibrated top-of-atmosphere (TOA) reflectance. Calibration coefficients are extracted from the image metadata. See Chander et al. (2009) for details on the TOA computation.
The MCD43A4 V6 Nadir Bidirectional Reflectance Distribution Function Adjusted Reflectance (NBAR) product provides 500 meter reflectance data of the MODIS "land" bands 1-7. These are adjusted using a bidirectional reflectance distribution function to model the values as if they were collected from a nadir view. The data are produced daily based on a 16-day retrieval period, with the image's date occurring on the 9th day. This product combines data from both the Terra and Aqua spacecrafts, choosing the best representative pixel from the 16-day period.
Hyperion is a high resolution hyperspectral imager producing 220 unique spectral channels ranging from 0.357 to 2.576 micrometers with a 10-nm bandwidth. The instrument operates in a pushbroom fashion, with a spatial resolution of 30 meters for all bands and a standard scene width of 7.7 kilometers.
Landsat 4 TM Collection 1 Tier 1 calibrated top-of-atmosphere (TOA) reflectance. Calibration coefficients are extracted from the image metadata. See Chander et al. (2009) for details on the TOA computation.
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Landsat 5 TM Collection 1 Tier 1 calibrated top-of-atmosphere (TOA) reflectance. Calibration coefficients are extracted from the image metadata. See Chander et al. (2009) for details on the TOA computation.
最近遇到一个新需求，成品如下，就是WiFi扫描界面增加一个选项，可以只扫描2.4G或者5G的AP。
Landsat 8 Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
目前WiFi已经推出了6G频段,Android源码中也增加了相关的功能，这里总结一下。
Landsat 8 Collection 1 Tier 1 calibrated top-of-atmosphere (TOA) reflectance. Calibration coefficients are extracted from the image metadata. See Chander et al. (2009) for details on the TOA computation.
本文介绍基于Python中的gdal模块，对大量长时间序列的栅格遥感影像文件，绘制其每一个波段中、若干随机指定的像元的时间序列曲线图的方法。
#%% #载入数据 、查看相关信息 import pandas as pd import numpy as np from sklearn.preprocessing import LabelEncoder print('第一步：加载、查看数据') file_path = r'D:\train\201905data\liwang.csv' band_data = pd.read_csv(file_path,encoding='UTF-8') band_data.info() band_data.
Landsat 5 TM Collection 1 Tier 2 DN values, representing scaled, calibrated at-sensor radiance.
FREF = FREF-Offs +ΔFGlobal (NREF –NREF-Offs)
Landsat 8 Collection 1 Tier 1 and Real-Time data DN values, representing scaled, calibrated at-sensor radiance.
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Landsat 3 MSS Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
Landsat 4 TM Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
Landsat 8陆地资源卫星于2013年2月11日成功发射，日前发表过一篇博文关于利用Landsatlook Viewer进行Landsat 8影像数据的下载（http://blog.csdn.net/arcgis_all/article/details/9136493），今天咱来谈谈卫星的各种波段组合情况，为具体应用奠定基础。我们都知道Landsat8同以前的Landsat系列卫星相比，在保留已有波段的基础上，又新增了一些波段，比如沿海蓝波段（coastal blue band），可以进行水体普及率/气溶胶检测；卷云波段（cirrus cloud band）用于云去除及其它应用。下面是Landsat 8应用过程中常见的波段组合形式，影像将显示为RGB形式：
Landsat 5 MSS Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
Landsat 4 MSS Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
Landsat 1 MSS Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
Landsat 2 MSS Collection 1 Tier 1 DN values, representing scaled, calibrated at-sensor radiance.
The MCD43C3 Version 6 Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) Albedo dataset is produced daily using 16 days of Terra and Aqua MODIS data in a 0.05 degree (5,600 meters at the equator) Climate Modeling Grid (CMG). Data are temporally weighted to the ninth day of the retrieval period which is reflected in the Julian date in the file name. This CMG product covers the entire globe for use in climate simulation models. MCD43C3 provides black-sky albedo (directional hemispherical reflectance) and white-sky albedo (bihemispherical reflectance) at local solar noon. Black-sky albedo and white-sky albedo values are available as a separate layer for MODIS spectral bands 1 through 7 as well as the visible, near infrared (NIR), and shortwave bands. Along with the 20 albedo layers are ancillary layers for quality, local solar noon, percent finer resolution inputs, snow cover, and uncertainty. See dataset user guide for more information.
在渗透测试当中，当我们遇到没有回显的漏洞是非常难以利用，因为我们无从得知存不存在漏洞，另外是我们无法得知漏洞执行的结果。因此，针对无回显漏洞，我们可以通过使用DNSLog来进行回显，DNSLog是一种回显机制，攻击者可以通过DNS的解析日志来读取漏洞执行的回显结果。
有时候，我们需要执行数据分箱操作，而pandas提供了一个方便的方法cut可以实现。
该文介绍了如何基于客户分段进行精细运营，包括客户分段的定义和意义、基于客户分段设计运营指标和运营模型、运营指标和运营模型的值域和意义以及基于客户分段的运营流程和运营指标体系。同时，文章还介绍了如何结合客户分段运营指标体系进行运营设计，并通过实例进行了说明。
第一个 "和 "最后一个 "波段是大地遥感卫星光谱波段（红、近红外、SWIR1 和 SWIR2）的第一个和最后一个可用年份的参考多光谱图像。参考复合图像代表了这些波段中每个波段的生长季节质量评估观测数据集的中值观测数据。
NV(NonVoliatile) 参数就是保存在终端上的非易失参数，可以通过 view 中的 NV Browser 来进行查看和修改。这些信息由厂家固化在终端内部，一般不允许用户修改。同时，可以通过NV Browser对终端进行 Offline（掉电重启）操作。
注意读取数据的数组下标不要越界！GDAL并不会自动帮你处理下标越界的问题，它只会报错。因此特别当你想用部分读取的方式处理一个很大的文件时，对边界的处理需要你特别的注意，必须正好读完不能越界也不能少读。
The mosaics are created by using the MODIS 8-Day 500 meter BRDF-Albedo Quality product. Data Quality flags are used to select the best observations from the MODIS 8-day 500 meter Nadir BRDF-Adjusted Reflectance imagery product. This specific mosaic picks observations from the three highest quality categories over a 1-year period of MODIS data.
这需要两次遍历表：一次用于分母，一次用于百分比。对于针对大型表的 BI 查询（即：对于大多数 BI 查询），更多的表传递会显著降低性能。
The Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Emissivity Database (ASTER-GED) was developed by the National Aeronautics and Space Administration's (NASA) Jet Propulsion Laboratory (JPL), California Institute of Technology. This product includes the mean emissivity and standard deviation for all 5 ASTER Thermal Infrared bands, mean land surface temperature (LST) and standard deviation, a re-sampled ASTER GDEM, land-water mask, mean Normalized Difference Vegetation Index (NDVI) and standard deviation, and observation count.
美国NASA的陆地卫星(Landsat)计划从1972年7月23日以来，已发射8颗（第6颗发射失败）。目前Landsat1-4均相继失效，Landsat-5于2013年6月退役。Landsat-7于1999年4月15日发射 升空。Landsat-8于2013年2月11日发射升空，经过100天测试运行后开始获取影像。
GSM和NB-IOT使用894-909/939-949MHz(10MHz)，LTE FDD 使用889-894/934-939MHz (5MHz)，原904-909MHz/949-954MHz 让给中国联通。
This dataset is the atmospherically corrected surface reflectance from the Landsat 8 OLI/TIRS sensors. These images contain 5 visible and near-infrared (VNIR) bands and 2 short-wave infrared (SWIR) bands processed to orthorectified surface reflectance, and two thermal infrared (TIR) bands processed to orthorectified brightness temperature
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