diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..3f7d229
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,80 @@
+name: Analyze
+
+on:
+  push:
+    branches: [ '**' ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  bandit:
+    runs-on: ubuntu-24.04
+    name: bandit
+    steps:
+    - uses: actions/checkout@v2
+    - name: install
+      run: |
+        sudo apt update
+        sudo apt upgrade
+        sudo apt install python3
+    - name: info
+      run: |
+        python3 --version
+    - name: bandit
+      run: |
+        pip install bandit
+        bandit ./world-dl.py
+  pylint:
+    runs-on: ubuntu-24.04
+    name: pylint
+    steps:
+      - uses: actions/checkout@v2
+      - name: install
+        run: |
+          sudo apt update
+          sudo apt upgrade
+          sudo apt install python3 libsqlite3-dev python3-gdal python3-numpy
+      - name: info
+        run: |
+          python3 --version
+      - name: pylint
+        run: |
+          pip install "pylint" "requests" "argparse" "pysqlite3" "tqdm"
+          pylint --disable=old-style-class --module-naming-style=any ./world-dl.py
+  coverage:
+    runs-on: ubuntu-24.04
+    name: coverage
+    env:
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: install
+        run: |
+          sudo apt update
+          sudo apt upgrade
+          sudo apt install python3 libsqlite3-dev python3-gdal python3-numpy
+      - name: info
+        run: |
+          python3 --version
+      - name: coverage
+        run: |
+          RUN() { echo -e "\033[36;1m\$ $@ \033[0m" ; "$@" ; }
+          RUN pip install "codecov" "coverage" "requests" "argparse" "pysqlite3" "tqdm"
+
+          RUN coverage run world-dl.py -a init -s 131072 -b 1024 -i ./input/google_map.img -o ./out -m ./data/mask-no-ant-3857.tif
+          RUN coverage run --append world-dl.py -a download -ov -c LZMA -t 512 -i ./input/google_map.img -o ./out
+          RUN rm ./out/gmap_0_0.tif
+          RUN rm ./out/gmap_0_1024.tif
+          RUN echo "Hello" >> ./out/gmap_1024_1024.tif
+          RUN coverage run --append world-dl.py -a merge -v -i ./input/google_map.img -o ./out || true
+          RUN coverage run --append world-dl.py -a download -ov -c LZMA -t 512 -i ./input/google_map.img -o ./out
+          RUN coverage run --append world-dl.py -a merge -v -i ./input/google_map.img -o ./out
+
+          RUN coverage run --append world-dl.py -a init -s 131072 -b 1024 -i ./input/google_map.img -o ./out -ml ./data/au.geojson
+          RUN coverage run --append world-dl.py -a download -ov -c LZMA -t 512 -i ./input/google_map.img -o ./out
+
+          RUN coverage report --include world-dl.py
+
+      - name: codecov
+        if: ${{ success() }}
+        run: codecov
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 06f6851..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-language: python
-matrix:
-  include:
-    - python: "3.7"
-      dist: xenial
-    - python: "3.8"
-      dist: bionic
-
-addons:
-  apt:
-  - python3-gdal
-script:
-  - pip install numpy argparse pysqlite3
-  - python world-dl.py -a init -s 65536 -b 1024 -i ./input/google_map.img -o ./out -m ./data/mask-no-ant-3857.tif -ml ./data/au.geojson
-  - python world-dl.py -a download -ov -c LZMA -i ./input/google_map.img -o ./out
diff --git a/README.md b/README.md
index 39aaa9b..50e7b20 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 [![codefactor.io](https://www.codefactor.io/repository/github/drons/world-dl/badge?style=flat-square)](https://www.codefactor.io/repository/github/drons/world-dl)
 [![codecov](https://codecov.io/gh/drons/world-dl/branch/master/graph/badge.svg)](https://codecov.io/gh/drons/world-dl)
-[![Build Status](https://ci.appveyor.com/api/projects/status/github/drons/world-dl?branch=master&svg=true)](https://ci.appveyor.com/project/drons/nbody/world-dl/master)
+[![Build Status](https://github.com/drons/world-dl/actions/workflows/main.yml/badge.svg?branch=master](https://github.com/drons/world-dl/actions/workflows/main.yml)
 # Imagery download tool from web image services
 
 ## How to run
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index 1334245..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-image: Ubuntu2204
-
-install:
-    - sudo apt-get update -y -q
-    - sudo apt-get install -y -q virtualenv python3-gdal python3-numpy
-    - virtualenv -p /usr/bin/python3 --system-site-packages ./venv
-    - source ./venv/bin/activate
-    - pip install --upgrade pip
-    - pip install --upgrade tqdm codecov coverage pylint bandit requests argparse pysqlite3
-
-build: off
-
-test_script:
-  - source ./venv/bin/activate
-  - pylint --disable=old-style-class --module-naming-style=any ./world-dl.py
-  - bandit ./world-dl.py
-  - coverage run world-dl.py -a init -s 131072 -b 1024 -i ./input/google_map.img -o ./out -m ./data/mask-no-ant-3857.tif
-  - coverage run --append world-dl.py -a download -ov -c LZMA -t 512 -i ./input/google_map.img -o ./out
-  - rm ./out/gmap_0_0.tif
-  - rm ./out/gmap_0_1024.tif
-  - echo "Hello" >> ./out/gmap_1024_1024.tif
-  - coverage run --append world-dl.py -a merge -v -i ./input/google_map.img -o ./out || true
-  - coverage run --append world-dl.py -a download -ov -c LZMA -t 512 -i ./input/google_map.img -o ./out
-  - coverage run --append world-dl.py -a merge -v -i ./input/google_map.img -o ./out
-
-  - coverage run --append world-dl.py -a init -s 131072 -b 1024 -i ./input/google_map.img -o ./out -ml ./data/au.geojson
-  - coverage run --append world-dl.py -a download -ov -c LZMA -t 512 -i ./input/google_map.img -o ./out
-
-
-  - coverage report --include world-dl.py
-
-on_success:
-  - codecov
diff --git a/world-dl.py b/world-dl.py
index 78eeb87..0bc0ea1 100644
--- a/world-dl.py
+++ b/world-dl.py
@@ -3,6 +3,7 @@
 """
 from __future__ import print_function
 
+import math
 import sys
 import os
 import shutil
@@ -33,10 +34,10 @@ def window(self):
 
     def mask_boundary(self, mask_scale):
         """:returns block's bounds at mask image"""
-        return (int(self.offset_x * self.scale / mask_scale),
-                int(self.offset_y * self.scale / mask_scale),
-                int((self.offset_x + self.size) * self.scale / mask_scale),
-                int((self.offset_y + self.size) * self.scale / mask_scale))
+        return (math.floor(self.offset_x * self.scale / mask_scale),
+                math.floor(self.offset_y * self.scale / mask_scale),
+                math.ceil((self.offset_x + self.size) * self.scale / mask_scale),
+                math.ceil((self.offset_y + self.size) * self.scale / mask_scale))
 
 
 def get_db(args):
@@ -95,7 +96,11 @@ def open_mask(args, input_ds):
             mask_ds.RasterYSize >= input_ds.RasterYSize:
         print('Too big mask image. Discard it.')
         mask_ds = None
+        return mask_ds, 1
     mask_scale = int(input_ds.RasterXSize / mask_ds.RasterXSize)
+    print('Mask scale', mask_scale)
+    print('Mask pixels per block',
+          (args.block_size * mask_ds.RasterXSize * args.scale) / input_ds.RasterXSize)
     if mask_scale != int(input_ds.RasterYSize / mask_ds.RasterYSize):
         print('WARNING: Mask image have non uniform scale relative to input dataset')
     mask = mask_ds.GetRasterBand(1).ReadAsArray()